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Fonseca MC, Pupo-Meriño M, García-González LA, Muné M, Resik S, Norder H, Sarmiento L. Molecular Characterization of Coxsackievirus A24v from Feces and Conjunctiva Reveals Epidemiological Links. Microorganisms 2021; 9:531. [PMID: 33807540 PMCID: PMC7998715 DOI: 10.3390/microorganisms9030531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 02/28/2021] [Accepted: 03/01/2021] [Indexed: 11/22/2022] Open
Abstract
Coxsackievirus A24 variant (CVA24v), the main causative agent of acute hemorrhagic conjunctivitis (AHC), can be isolated from both the eyes and lower alimentary tract. However, the molecular features of CVA24v in feces is not well-documented. In this study, we compared the VP1 and 3C sequences of CVA24v strains isolated from feces during AHC epidemics in Cuba in 1997, 2003, and 2008-2009 with those obtained from conjunctival swabs during the same epidemic period. The sequence analyses of the 3C and VP1 region of stool isolates from the three epidemics showed a high degree of nucleotide identity (ranging from 97.3-100%) to the corresponding conjunctival isolates. The phylogenetic analysis showed that fecal CVA24v isolates from the 1997 and 2003 Cuban outbreaks formed a clade with CVA24v strains isolated from conjunctival swabs in Cuba and other countries during the same period. There were three amino acid changes (3C region) and one amino acid change (VP1 region) in seven CVA24v strains isolated sequentially over 20 days from fecal samples of one patient, suggesting viral replication in the intestine. Despite these substitutions, the virus from the conjunctival swab and fecal samples were genetically very similar. Therefore, fecal samples should be considered as a reliable alternative sample type for the routine molecular diagnosis and molecular epidemiology of CVA24v, also during outbreaks of AHC.
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Affiliation(s)
- Magilé C. Fonseca
- Virology Department, Center for Research Diagnosis, and Reference, Institute of Tropical Medicine “Pedro Kourí”, Havana 11400, Cuba; (M.M.); (S.R.)
| | - Mario Pupo-Meriño
- Departamento de Bioinformática, Universidad de las Ciencias Informáticas (UCI), Habana 19370, Cuba;
| | - Luis A. García-González
- Centro de Estudios de Matemática Computacional, Universidad de las Ciencias Informáticas (UCI), Habana 19370, Cuba;
- Departamento de Ciencias de la Computación, Centro de Investigación Científica y de Educación Superior de Ensenada, 22860 Ensenada, Mexico
| | - Mayra Muné
- Virology Department, Center for Research Diagnosis, and Reference, Institute of Tropical Medicine “Pedro Kourí”, Havana 11400, Cuba; (M.M.); (S.R.)
| | - Sonia Resik
- Virology Department, Center for Research Diagnosis, and Reference, Institute of Tropical Medicine “Pedro Kourí”, Havana 11400, Cuba; (M.M.); (S.R.)
| | - Heléne Norder
- Department of Infectious Diseases/Virology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, 40530 Gothenburg, Sweden;
- Department of Clinical Microbiology, Region Västra Götaland, Sahlgrenska University Hospital, 41345 Gothenburg, Sweden
| | - Luis Sarmiento
- Immunovirology Unit, Department of Clinical Sciences, Skåne University Hospital, Lund University, 22185 Malmo, Sweden
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2
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Fonseca MC, Pupo-Meriño M, García-González LA, Resik S, Hung LH, Muné M, Rodríguez H, Morier L, Norder H, Sarmiento L. Molecular evolution of coxsackievirus A24v in Cuba over 23-years, 1986-2009. Sci Rep 2020; 10:13761. [PMID: 32792520 PMCID: PMC7427094 DOI: 10.1038/s41598-020-70436-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 07/21/2020] [Indexed: 12/29/2022] Open
Abstract
Coxsackievirus A24 variant (CVA24v) is a major causative agent of acute hemorrhagic conjunctivitis outbreaks worldwide, yet the evolutionary and transmission dynamics of the virus remain unclear. To address this, we analyzed and compared the 3C and partial VP1 gene regions of CVA24v isolates obtained from five outbreaks in Cuba between 1986 and 2009 and strains isolated worldwide. Here we show that Cuban strains were homologous to those isolated in Africa, the Americas and Asia during the same time period. Two genotypes of CVA24v (GIII and GIV) were repeatedly introduced into Cuba and they arose about two years before the epidemic was detected. The two genotypes co-evolved with a population size that is stable over time. However, nucleotide substitution rates peaked during pandemics with 4.39 × 10-3 and 5.80 × 10-3 substitutions per site per year for the 3C and VP1 region, respectively. The phylogeographic analysis identified 25 and 19 viral transmission routes based on 3C and VP1 regions, respectively. Pandemic viruses usually originated in Asia, and both China and Brazil were the major hub for the global dispersal of the virus. Together, these data provide novel insight into the epidemiological dynamics of this virus and possibly other pandemic viruses.
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Affiliation(s)
- Magilé C Fonseca
- Virology Department, Center for Research, Diagnosis and Reference, Institute of Tropical Medicine "Pedro Kourí" (IPK), Novia del Mediodía Km 61/2, La Lisa, Marianao 13, P.O. Box: 601, Havana, Cuba.
| | - Mario Pupo-Meriño
- Departamento de Bioinformática, Centro de Matemática Computacional, Universidad de las Ciencias Informáticas (UCI), Havana, Cuba
| | - Luis A García-González
- Departamento de Ciencias de la Computación, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, México
| | - Sonia Resik
- Virology Department, Center for Research, Diagnosis and Reference, Institute of Tropical Medicine "Pedro Kourí" (IPK), Novia del Mediodía Km 61/2, La Lisa, Marianao 13, P.O. Box: 601, Havana, Cuba
| | - Lai Heng Hung
- Virology Department, Center for Research, Diagnosis and Reference, Institute of Tropical Medicine "Pedro Kourí" (IPK), Novia del Mediodía Km 61/2, La Lisa, Marianao 13, P.O. Box: 601, Havana, Cuba
| | - Mayra Muné
- Virology Department, Center for Research, Diagnosis and Reference, Institute of Tropical Medicine "Pedro Kourí" (IPK), Novia del Mediodía Km 61/2, La Lisa, Marianao 13, P.O. Box: 601, Havana, Cuba
| | - Hermis Rodríguez
- Cell Culture Laboratory, Center for Research, Diagnosis and Reference, Institute of Tropical Medicine "Pedro Kourí" (IPK), Havana, Cuba
| | - Luis Morier
- Department of Microbiology and Virology, Biology Faculty, Havana University, Havana, Cuba
| | - Heléne Norder
- Department of Infectious Diseases/Virology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Luis Sarmiento
- Immunovirology Unit, Department of Clinical Sciences, Skåne University Hospital, Lund University, Malmö, Sweden
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3
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Arencibia A, Piñón A, Acosta B, Fernandez L, Muné M, Valdés O, Savón C, Oropesa S, Gonzalez G, Roque R, Gonzalez G, Hernández B, Alfonso JM. Vaccine-mismatched influenza B/Yamagata lineage viruses in Cuba, 2012-2013 season. Infect Genet Evol 2017; 58:110-114. [PMID: 29229320 DOI: 10.1016/j.meegid.2017.12.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 11/24/2017] [Accepted: 12/06/2017] [Indexed: 10/18/2022]
Abstract
Annual trivalent influenza vaccines contain one of influenza B lineages; influenza B/Victoria-lineage or influenza B/Yamagata viruses. Theoretically, these vaccines should protect against viruses expected to circulate in the next influenza season. The National Influenza Centers, based on surveillance data from National Reference Laboratories, selects the strains composing each annual trivalent or tetravalent vaccine. Nevertheless, in some epidemics, vaccine strains do not match genetically with circulating strains. The aim of the present study is to compare the HA1-domain of 42 influenza B viruses circulating in Cuba during the 2012-2013 season with the vaccine strain B/Wisconsin/01/2010-like virus from the B/Yamagata lineage, included in the 2012-2013 Northern-Hemisphere Influenza vaccine. The efficacy of the influenza vaccine was also estimated. The analysis of the present study indicates that the B/Victoria and B/Yamagata lineages co-circulated in Cuba in the 2012-2013 season. In 2012-2013 season, according to the sequences analysis, trivalent vaccine did not match with the circulating strains. The present study also detected amino acid substitutions which could have altered the antigenic properties of HA gene. The results presented here suggest the need to consider a possible introduction of tetravalent influenza vaccine in Cuba, as has been recommended by the WHO to ensure higher levels of protection.
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Affiliation(s)
| | - Alexander Piñón
- University of Miami, Miller School of Medicine, Department of Surgery Transplant, 1600 NW 10th Ave., Miami, FL 33136, United States
| | | | | | - Mayra Muné
- Pedro Kourí Tropical Medicine Institute, Cuba
| | | | - Clara Savón
- Pedro Kourí Tropical Medicine Institute, Cuba
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4
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Arencibia A, Acosta B, Muné M, Valdés O, Fernandez L, Savón C, Oropesa S, Gonzalez G, Gonzalez G, Hernández B, Roque R, Goyenechea A, Piñón A. Genetic drift of hemagglutinin (HA) of influenza A(H3N2) viruses circulating in Cuba between 2011 and 2013. Infect Genet Evol 2014; 28:58-61. [PMID: 25220618 DOI: 10.1016/j.meegid.2014.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 08/26/2014] [Accepted: 09/01/2014] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Mayra Muné
- Pedro Kourí Tropical Medicine Institute, Cuba
| | | | | | - Clara Savón
- Pedro Kourí Tropical Medicine Institute, Cuba
| | | | | | | | | | | | | | - Alexander Piñón
- Pedro Kourí Tropical Medicine Institute, Autopista Novia del Mediodía Km 6 1/2, Apdo. Postal 601, Marianao 13, La Lisa, La Habana, Cuba.
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5
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Abstract
Dengue transmission has increased considerably in the past 20 years. Currently, it can only be reduced by mosquito control; however, the application of vector-control methods are labor intensive, require discipline and diligence, and are hard to sustain. In this context, a safe dengue vaccine that confers long-lasting protection against infection with the four dengue viruses is urgently required. This review will discuss the requirements of a dengue vaccine, problems, and advances that have been made. Finally, new targets for research will be presented.
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Affiliation(s)
- María G Guzmán
- Pedro Kourí Tropical Medicine Institute, Autopista Novia del Mediodía, Km 6 1\2 P.O. Box Marianao 13, C. Habana, Cuba.
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6
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Piñón A, Acosta B, Valdés O, Pérez A, Muné M, Arencibia A, Savón C, Goyenechea A, Oropesa S, González G, González G, Hernández B. Adamantane and neuraminidase inhibitor resistance among circulating human influenza A viruses in Cuba during 2006-2010. Int J Antimicrob Agents 2013; 42:97-8. [PMID: 23648224 DOI: 10.1016/j.ijantimicag.2013.03.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 03/12/2013] [Accepted: 03/18/2013] [Indexed: 11/16/2022]
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7
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Acosta B, Piñón A, Valdés O, Savón C, Arencibía A, Guilarte E, Grehete G, Oropesa S, Guelsys G, Hernández B, Goyenechea A, Muné M, Kouri V, Guzmán MG, Llop A. Rapid diagnosis of pandemic (H1N1) 2009 in Cuba. Emerg Infect Dis 2012; 18:336-7. [PMID: 22304939 PMCID: PMC3310444 DOI: 10.3201/eid1802.110547] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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8
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Rodríguez ME, Llop A, Capó V, Kourí V, Resik S, Rojas L, Soto Y, Muné M, Rodríguez I, Hengge UR. Human immunodeficiency virus and other sexually transmitted diseases in Cuban women. Clin Microbiol Infect 2005; 11:764-7. [PMID: 16104994 DOI: 10.1111/j.1469-0691.2005.01209.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
A cross-sectional study was performed in 60 Cuban women of child-bearing age who were seropositive for human immunodeficiency virus (HIV) and 60 controls. Human papillomavirus (HPV) was identified most frequently, with oncogenic HPV serotypes 16, 33 and 58 detected in HIV-positive patients, and serotypes 11, 33 and 51 in the controls (relative risk 4.41; 95% CI 2.21-8.29). Syphilis and hepatitis B and C viruses were detected exclusively in HIV-seropositive women (p<0.05). Sexually transmitted diseases (STDs) appeared to pose a substantial health problem, especially for HIV-positive women. Clinics should consider screening and treatment for STDs as part of their HIV prevention programmes.
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Affiliation(s)
- M E Rodríguez
- Department of Medicine, Institute of Tropical Medicine Pedro Kouri, Habana, Cuba
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9
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Muné M, Rodríguez R, Ramírez R, Soto Y, Sierra B, Rodríguez Roche R, Marquez G, Garcia J, Guillén G, Guzmán MG. Carboxy-terminally truncated Dengue 4 virus envelope glycoprotein expressed in Pichia pastoris induced neutralizing antibodies and resistance to Dengue 4 virus challenge in mice. Arch Virol 2003; 148:2267-73. [PMID: 14579183 DOI: 10.1007/s00705-003-0167-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
We have expressed a recombinant Dengue 4 virus envelope glycoprotein (E4rec), truncated at its C-terminus by 53 amino acids, in Pichia pastoris. The presence of E4rec was confirmed by Western-blot using anti-DEN 4 hyper immune mouse ascitic fluid. E4rec migrated during SDS-PAGE as a 64 kDa protein. Treatment with endoglycosidases showed that the E protein was modified by the addition of short mannose chains and the absence of hyperglycosylation. When administered to BALB-C mice, E4rec elicited a DEN 4 neutralizing antibody response haemagglutination inhibition antibodies and specific memory T cell response. Mice immunized were also significantly protected against lethal DEN 4 virus challenge (86.6%, p < 0.001).
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Affiliation(s)
- M Muné
- Virology Department, PAHO/WHO Collaborating Center for Viral Diseases, Pedro Kourí Tropical Medicine Institute, Havana, Cuba.
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10
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Guzmán MG, Rodríguez R, Rodríguez R, Hermida L, Alvarez M, Lazo L, Muné M, Rosario D, Valdés K, Vázquez S, Martinez R, Serrano T, Paez J, Espinosa R, Pumariega T, Guillén G. Induction of neutralizing antibodies and partial protection from viral challenge in Macaca fascicularis immunized with recombinant dengue 4 virus envelope glycoprotein expressed in Pichia pastoris. Am J Trop Med Hyg 2003; 69:129-34. [PMID: 13677367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/23/2023] Open
Abstract
A recombinant vaccine that expresses the envelope (E) gene of dengue virus type 4 was tested for immunogenicity and protection in Macaca fascicularis. One hundred micrograms of semipurified recombinant E protein (E4rec) expressed in Pichia pastoris was used to immunize three animals. Neutralizing antibodies to dengue 4 virus with a titer of 1:30 were detected in all immunized monkeys prior to challenge. Animals were challenged with 10(5) plaque-forming units of dengue 4 virus. One vaccine-immunized monkey was protected from viremia, while the other two were partially protected. Monkeys immunized with E4rec elicited the highest neutralizing antibody titers (P < 0.05) ranging from 1:85 to 1:640 at day 30. In both immunized and control animals, the longest duration of viremia correlated with earliest and highest level of IgM antibody to dengue virus. The vaccinated animals showed anamnestic antibody responses upon virus challenge, indicating successful priming by the recombinant vaccine. Our results suggest that E4rec expressed in P. pastoris can provide partial protection against viremia. However, the results were not effective enough to use it as a vaccine candidate. Further work is required to improve the quality of the immunogen.
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Affiliation(s)
- María G Guzmán
- Virology Department, Pan American Health Organization/World Health Organization Collaborating Center for Viral Diseases, Pedro Kourí Tropical Medicine Institute, Autopista Novia del Mediodía, Havana, Cuba.
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11
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Kouri V, Cartaya J, Rodríguez ME, Muné M, Soto Y, Resik S, Bravo J, Llop A. Prevalence of Chlamydia trachomatis in human immunodeficiency virus-infected women in Cuba. Mem Inst Oswaldo Cruz 2002; 97:1073-7. [PMID: 12563468 DOI: 10.1590/s0074-02762002000800001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
To determine the prevalence rates and serovar distribution of Chlamydia trachomatis cervical infections in Cuban women, two different groups were selected. Group I consisted of 60 human immunodeficiency virus (HIV-1) seropositive women from different regions of Cuba and group II of 60 randomly selected women HIV seronegative and apparently healthy. C. trachomatis was detected in cervical scrapes by mean of nested polymerase chain reaction (PCR) specific for major out membrane protein. The overall prevalence rate of C. trachomatis in cervical scrapes determined by nested PCR was 10% in group I and the estimated prevalence was 6.6% for group II; 83.3% of HIV seropositive women with C. trachomatis infection reported history of pelvic inflammatory disease followed by cervicitis (50%). The control group C. trachomatis-infected women referred a history of cervicitis in 75% of cases. Other reports in the latter group included infertility and pelvic inflamatory disease in 50%. The present study is the first report of C. trachomatis prevalence in Cuba. It showed that there was not significantly difference in the prevalence rate of C. trachomatis between both groups.
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Affiliation(s)
- Vivian Kouri
- Departamento de Virología, Instituto de Medicina Tropical 'Pedro Kouri', Ciudad de la Habana, Cuba.
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12
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Pumariega T, Savón C, Muné M, Cancio R, González G, Valdivia A, González Z, Goyenechea A. Isolation and identification of adenovirus in hospitalized children, under five years, with acute respiratory disease, in Havana, Cuba. Mem Inst Oswaldo Cruz 2000; 95:859-61. [PMID: 11080775 DOI: 10.1590/s0074-02762000000600020] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nine Adenovirus (Ad) strains isolated in Cuba, from 128 nasopharingeal swab specimens of children below five years old, with acute respiratory diseases, during 1996 and 1997, were studied by restriction enzyme analysis of genomic DNA with two endonucleases BamH I and Sma I. All different fragment patterns were compared with the respective prototypes. The identified adenoviruses were Ad 1 (n=4), Ad 2 (n=1) and Ad 6 (n=4). Males were more frequently infected than females. The analysis of the occurrence of these Adenovirus strains of subgenus C revealed that Ad 1 and Ad 6 were the predominant serotypes in 1996 and in 1997, respectively.
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Affiliation(s)
- T Pumariega
- Instituto de Medicina Tropical Pedro Kourí, Habana, Cuba
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13
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Soto Y, Muné M, Goicolea A, Morales E, Santoyo JM, Valdés O, Ramírez R, Pimentel T. [The application of the polymerase chain reaction technic for the detection of human papillomavirus sequences]. Rev Cubana Med Trop 1999; 50:191-8. [PMID: 10349442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
The polymerase chain reaction technique was applied to detect sequences of human Papillomavirus (HPV) by controls of cellular lines of cervical cancer and of tissues obtained through biopsy with a HPV-positive clinical diagnosis. A set of consensus oligonucleotides, which are complementary to a highly conserved region within the open reading frame E1 of the viral genome of HPV affecting the cervical mucosa, was used. With these primers it was possible to amplify DNA sequences corresponding to HPV 6 and 11, considered in the low risk group, and to HPV 16, 18, 31 and 33, included in the high risk group. The study of the sensitivity of the amplification technique showed a level of detection of 3,5 viral particles per each cellular diploid genome.
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Affiliation(s)
- Y Soto
- Instituto de Medicina Tropical Pedro Kourí, Ciudad de La Habana, Cuba
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14
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Savón C, Muné M, Goyenechea A, Valdivia A, Soto Y, Pérez L. [Follicular conjunctivitis caused by an adenovirus. The characterization of its strains by restriction endonucleases]. Rev Cubana Med Trop 1998; 47:195-8. [PMID: 9813475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
A study of conjunctivitis cases with a possible viral cause was carried out in Havana City during June and August, 1993. Thirty seven cases from "Ramón Pando Ferrer" Ophthalmological Hospital were studied, of whom 13 isolations (35.1%) in cell culture of Hela cells were obtained. Isolations showed a cytopathic effect characteristic of Adenovirus. A direct immunofluorescence with conjugated serum of rabbit specific to Adenovirus was performed and results were positive in 100% of cases. A DNA restriction analysis of each isolated was performed for their classification. Restriction endonucleases SmaI and Hind III were used and 2 isolates were classified as Adenovirus type 3, and 6 as Adenovirus type 7b, 4 out of 13 isolates were not classified because of the degradation of the genetic material.
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Affiliation(s)
- C Savón
- Instituto de Medicina Tropical Pedro Kourí
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15
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Valdivia A, Alvarez M, Marrero M, Valdés O, Muné M. [Diagnosis of cytomegalovirus infections in patients with HIV infection. Comparison of the indirect immunofluorescence and viral isolation techniques]. Rev Cubana Med Trop 1998; 44:212-5. [PMID: 9768219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The technique for the detection of fluorescent early antigen was compared to the classical method of viral isolation in cells from the human lung. The study was performed with the use of 85 urine samples from 64 patients presenting with HIV infection. The technique for the detection of fluorescent early antigens showed a sensitivity of 91%, an specificity of 97%, and a coincidence of 94% with respect to viral isolation. The main advantage of the technique for the detection of fluorescent early antigens with respect to viral isolation is that the former provides a quicker diagnosis of cytomegalovirus infection within 48-72 hours, besides being easy to perform.
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Affiliation(s)
- A Valdivia
- Instituto de Medicina Tropical Pedro Kouri
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16
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Guzmán MG, Rosario D, Muné M, Alvarez M, Rodríguez R, Kourí G. [Genetic relatedness of the dengue 3 virus isolated in the outbreak of dengue hemorrhagic fever in Nicaragua, 1994]. Rev Cubana Med Trop 1998; 48:114-7. [PMID: 9768281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
It is reported the isolation of 2 dengue strains, 3 in samples from Nicaraguan patients suffering from dengue with hemorrhagic manifestations, which showed the reintroduction of this serotype in the region after being 17 years out of circulation. It is also reported the genetic characterization of the isolated strain, which, according to its classification, belongs to the group of dengue 2 strains isolated in Southeast Asi and which have been associated to hemorrhagic dengue. These results suggest the origin of this strain.
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Affiliation(s)
- M G Guzmán
- Instituto de Medicina Tropical Pedro Kouri
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17
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Muné M, Alvarez M, Resik S, Soto Y, Más P, Guzmán MG. [Western blot study of sera from patients with epidemic neuropathy]. Rev Cubana Med Trop 1998; 49:94-9. [PMID: 9685970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The immune response of a group of patients with epidemical neuropathy and of controls was studied by the immunoblotting technique against proteins of the Coxsackie virus and the proteins of slow effect isolated in our laboratory. 13 sera of patients with epidemical neuropathy and 9 sera of controls were studied. Of the 13 sera studied, 8 (61.5%) recognized protein VPI and 2 sera (15.3%) protein VP0 of the strain 47.93. Of the 9 controls studied, 4 (44.4%) recognized protein VPI and 3 (33.3%) protein VP0 only. With the antigen prepared from the slow effect strain it was obtained a specific signal in 5 (38.5%) sera of patients and in 2 sera (22.5%) of controls. It should be stressed that in this last case the protein observed had a molecular weight of 41,300 D, and that its size was smaller than that of the preceding protein detected against the strain 47.93 was of 45,000 D.
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Affiliation(s)
- M Muné
- Instituto de Medicina Tropical Pedro Kourí
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18
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Soto Y, Valdés C, Muné M, Pimentel T, Ramirez R. Detection of type 16 human papillomavirus DNA in formalin-fixed invasive squamous cells from laryngeal cancers by polymerase chain reaction. Mem Inst Oswaldo Cruz 1998; 93:439-40. [PMID: 9711332 DOI: 10.1590/s0074-02761998000400004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Affiliation(s)
- Y Soto
- Instituto de Medicina Tropical Pedro Kouri, Ciudad de la Habana, Cuba
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Más P, Pelegrino JL, Guzmán MG, Comellas MM, Resik S, Alvarez M, Rodríguez R, Muné M, Capó V, Balmaseda A, Rodríguez L, Rodríguez MP, Handy J, Kourí G, Llop A. Viral isolation from cases of epidemic neuropathy in Cuba. Arch Pathol Lab Med 1997; 121:825-33. [PMID: 9278610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVE To investigate the possibility of a viral agent in the central nervous system of patients with epidemic neuropathy. DESIGN Virus isolation attempts, in cell cultures and suckling mice, from cerebrospinal fluid (CSF) of neuropathy patients and controls undergoing lumbar puncture for unrelated reasons. Serologic studies in patients, contacts, and controls. SETTING An epidemic of optic and peripheral neuropathy affected more than 50,000 people in Cuba in 1991 through 1993. Illness was associated with dietary limitations and increased physical demands accompanying the shortages of food and fuel experienced in Cuba since 1989. Most patients responded to parenteral vitamin therapy, and the epidemic began to subside when oral vitamin supplementation was begun for the entire Cuban population. RESULTS Coxsackievirus A9 (five isolates) and a similar, less cytopathic virus (100 isolates) were recovered from 105 (84%) of 125 CSF specimens from neuropathy patients. The strains with light cytopathic effect were antigenically related to Coxsackieviruses A9 and B4 by cross-neutralization and immunoblotting assays. Virus persisted in CSF of some patients for 1 to 12 months. Cerebrospinal fluid from patients and both types of virus from cell culture produced illness, including complete posterior flaccid paralysis, in newborn mice, and virus was reisolated from the mice. Mouse tissues and sural nerve biopsy specimens from patients were stained by immunoperoxidase and colloidal gold techniques using hyperimmune rabbit antisera against the virus with light cytopathic effect. CONCLUSIONS Coxsackievirus A9 or an antigenically related agent with a light cytopathic effect was present in CSF of 84% of 125 patients with epidemic neuropathy. The role of these agents, probably in combination with nutritional factors, in the pathophysiology of the disease requires further investigation.
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Affiliation(s)
- P Más
- Institute of Tropical Medicine Pedro Kourí, Ministry of Public Health, Havana, Cuba
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Más Lago P, Guzmán MG, Muné M, Resik S, Alvarez M. [Cuban epidemic neuropathy. II. The antigenic characteristics of the viral isolates]. Rev Cubana Med Trop 1995; 47:16-20. [PMID: 9805061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
Abstract
With the aim of characterizing antigenically isolations producing mild cytopathogenic effect obtained from the cerebrospinal fluid of patients presenting with epidemic neuropathy, neutralization tests and western blot analysis were performed using hyperimmune sera of patients and hyperimmune sera of rabbits. It was confirmed that isolations with mild cutopathogenic effect studied have the same antigenic characteristics and that they are related to Coxsackie A9 and B4 viruses. Structural proteins were not detected in the strains with mild cytopathogenic effects, only antigens having a high molecular weight which were considered as precursor proteins for viral replication were confirmed.
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Affiliation(s)
- P Más Lago
- Instituto de Medicina Tropical Pedro Kourí
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Soler M, Guzmán MG, Muné M, Kouri G. [Identification using indirect immunofluorescence technic of various strains of dengue isolated during the epidemic of Nicaragua in 1985]. Rev Cubana Med Trop 1988; 40:5-12. [PMID: 3072613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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