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Levin AE, Bangdiwala AS, Nalintya E, Kagimu E, Kasibante J, Rutakingirwa MK, Mpoza E, Jjunju S, Nuwagira E, Naluyima R, Kirumira P, Hou C, Ssebambulidde K, Musubire AK, Williams DA, Abassi M, Muzoora C, Hullsiek KH, Rajasingham R, Meya DB, Boulware DR, Skipper CP. Outpatient Cryptococcal Antigen Screening Is Associated With Favorable Baseline Characteristics and Improved Survival in Persons With Cryptococcal Meningitis in Uganda. Clin Infect Dis 2023; 76:e759-e765. [PMID: 35859045 PMCID: PMC10169421 DOI: 10.1093/cid/ciac599] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 07/09/2022] [Accepted: 07/15/2022] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND It is unknown whether persons with symptomatic cryptococcal meningitis detected during routine blood cryptococcal antigen (CrAg) screening have better survival than persons presenting with overt meningitis. METHODS We prospectively enrolled Ugandans with HIV and cryptocococcal meningitis from December 2018 to December 2021. Participants were treated with amphotericin-based combination therapy. We compared outcomes between persons who were CrAg screened then referred to hospital with those presenting directly to the hospital with symptomatic meningitis. RESULTS Among 489 participants with cryptococcal meningitis, 40% (194/489) received blood CrAg screening and were referred to hospital (median time to referral 2 days; interquartile range [IQR], 1-6). CrAg-screened persons referred to hospital had lower 14-day mortality than non-CrAg-screened persons who presented directly to hospital with symptomatic meningitis (12% vs 21%; hazard ratio, .51; 95% confidence interval, .32-.83; P = .006). Fewer CrAg-screened participants had altered mental status versus non-CrAg-screened participants (29% vs 41%; P = .03). CrAg-screened persons had lower quantitative cerebrospinal fluid (CSF) culture burden (median [IQR], 4570 [11-100 000] vs 26 900 [182-324 000] CFU/mL; P = .01) and lower CSF opening pressures (median [IQR], 190 [120-270] vs 225 [140-340] mmH2O; P = .004) compared with non-CrAg-screened persons. CONCLUSIONS Survival from cryptococcal meningitis was higher in persons with prior CrAg screening than those without CrAg screening. Altered mental status was the most potent predictor for mortality in a multivariate model. We suggest that CrAg screening detects cryptococcal meningitis at an earlier stage, as evidenced by a favorable baseline risk profile and notably fewer persons with altered mental status.
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Affiliation(s)
- Anna E Levin
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Ananta S Bangdiwala
- Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, Minnesota, USA
| | | | - Enock Kagimu
- Infectious Diseases Institute, Makerere University, Kampala, Uganda
| | - John Kasibante
- Infectious Diseases Institute, Makerere University, Kampala, Uganda
| | | | - Edward Mpoza
- Infectious Diseases Institute, Makerere University, Kampala, Uganda
| | - Samuel Jjunju
- Department of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Edwin Nuwagira
- Department of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Rose Naluyima
- Infectious Diseases Institute, Makerere University, Kampala, Uganda
| | - Paul Kirumira
- Infectious Diseases Institute, Makerere University, Kampala, Uganda
| | - Cody Hou
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | | | - Abdu K Musubire
- Infectious Diseases Institute, Makerere University, Kampala, Uganda
| | - Darlisha A Williams
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Mahsa Abassi
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Conrad Muzoora
- Department of Medicine, Mbarara University of Science and Technology, Mbarara, Uganda
| | - Katherine H Hullsiek
- Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, Minnesota, USA
| | - Radha Rajasingham
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - David B Meya
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
- Infectious Diseases Institute, Makerere University, Kampala, Uganda
- Department of Medicine, School of Medicine, Makerere University College of Health Sciences, Kampala, Uganda
| | - David R Boulware
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
| | - Caleb P Skipper
- Division of Infectious Diseases and International Medicine, Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA
- Infectious Diseases Institute, Makerere University, Kampala, Uganda
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Socransky SS, Smith C, Martin L, Paster BJ, Dewhirst FE, Levin AE. "Checkerboard" DNA-DNA hybridization. Biotechniques 1994; 17:788-92. [PMID: 7833043] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
A method is introduced for hybridizing large numbers of DNA samples against large numbers of DNA probes on a single support membrane. Denatured DNA from up to 43 samples was fixed in separate lanes on a single membrane mounted in a Miniblotter 45. The membrane was then rotated 90 degrees in the same device, which enabled simultaneous hybridization with 43 different DNA probes. Hybridizations were also performed on lysates of bacterial cells blotted to membranes. A MiniSlot device allowed lysates loaded in parallel channels to be aspirated through the membrane, depositing horizontal lanes on the membrane surface. Hybridizations were performed in vertical lanes with either digoxigenin-labeled whole genomic probes or 16S rRNA-based oligonucleotide probes directly conjugated to alkaline phosphatase. The method permits the simultaneous determination of the presence of multiple bacterial species in single or multiple dental plaque samples, thus suggesting its usefulness for a range of clinical or environmental samples.
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Levin AE, Travis SM, DeVito LD, Park KA, Nelson DL. Purification and characterization of a calcium-dependent ATPase from Paramecium tetraurelia. J Biol Chem 1989; 264:4544-51. [PMID: 2522445] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
We report the purification of a CaATPase of high specific activity from Paramecium tetraurelia. The enzyme is preferentially released into solution upon deciliation of cells by a Ca2+ shock procedure. Purification by ion exchange and gel filtration chromatography yields major peptides of 68 and 53 kDa and a minor peptide of 58 kDa, as determined by electrophoresis on sodium dodecyl sulfate polyacrylamide gels. These three peptides yield similar proteolytic peptide maps. Rabbit antisera to the purified enzyme inhibit enzyme activity and specifically label 68- and 53-kDa bands on nitrocellulose blots of the deciliation supernatant from which the enzyme is isolated. Concanavalin A-Sepharose precipitates about 60% of ATPase activity; only the 53-kDa band binds concanavalin A on nitrocellulose blots. The purified enzyme has a specific activity of 620 +/- 70 mumol/min/mg with ATP as substrate in the presence of Ca2+, which is required for enzyme activity. As substrates, ATP and GTP are strongly preferred to UTP and CTP. The Km for ATP in the presence of 3 mM Ca2+ is approximately 20 microM. Enzyme activity is strongly inhibited by the calmodulin antagonists trifluoperazine, fluphenazine, W7, and calmidazolium. However, calmodulin is not associated with the purified enzyme, based on the enzyme's inability to bind anti-calmodulin antibodies or to stimulate brain phosphodiesterase. The intracellular origin of this ATPase, its possible function, and its relationship to several other ATPases of Paramecium are discussed.
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Affiliation(s)
- A E Levin
- Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin-Madison 53706
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