Dynamics and immunomodulation of cognitive deficits and behavioral changes in non-severe experimental malaria

Data recently reported by our group indicate that stimulation with a pool of immunogens capable of eliciting type 2 immune responses can restore the cognitive and behavioral dysfunctions recorded after a single episode of non-severe rodent malaria caused by Plasmodium berghei ANKA. Here we explored the hypothesis that isolated immunization with one of the type 2 immune response-inducing immunogens, the human diphtheria-tetanus (dT) vaccine, may revert damages associated with malaria. To investigate this possibility, we studied the dynamics of cognitive deficits and anxiety-like phenotype following non-severe experimental malaria and evaluated the effects of immunization with both dT and of a pool of type 2 immune stimuli in reversing these impairments. Locomotor activity and long-term memory deficits were assessed through the open field test (OFT) and novel object recognition task (NORT), while the anxiety-like phenotype was assessed by OFT and light/dark task (LDT). Our results indicate that poor performance in cognitive-behavioral tests can be detected as early as the 12^th day after the end of antimalarial treatment with chloroquine and may persist for up to 155 days post infection. The single immunization strategy with the human dT vaccine showed promise in reversal of long-term memory deficits in NORT, and anxiety-like behavior in OFT and LDT.

Effectiveness of booster dose of tetanus and diphtheria toxoids (Td) vaccine in management of recurrent aphthous stomatitis: a prospective, randomized, triple-blind and placebo-controlled clinical trial

BACKGROUND

Recurrent aphthous stomatitis (RAS) is the most common oral disease. The activation of the immune system by vaccines might reduce the interactions between oral mucosa and microorganisms.

AIM

To evaluate the effect of the tetanus-diphtheria toxoids (Td) vaccine in management of RAS.

DESIGN AND SETTING

This prospective, randomized, triple-blind and placebo-controlled clinical trial study was conducted on 70 eligible patients with minor RAS at the dermatology outpatient clinic.

METHOD

Finally, a total of 66 participants (48 male, 18 female; mean age: 38.56 ± 10.98 years) completed the study in two groups, one in which colchicine and a single dose of vitamin B6 (placebo group) was treated and one in which colchicine and a single dose of Td vaccine (intervention group) was treated.

RESULTS

After six months of follow-up, the patients were evaluated, which revealed significant effects of the Td vaccine on pain intensity, ulcer size, recovery time, and the interval between episodes. At the end of the six month follow-up, 27 patients (81.8%) in the intervention group and 13 patients (39.4%) in the placebo group showed partial or complete recovery, and there was statistically significant difference between the groups (p < .001). Recovery was not significantly associated with sex, education level, marital status and duration of RAS. However, occupation and positive family history of RAS had significant relations with recovery.

CONCLUSIONS

A booster dose of Td vaccine had relatively favorable effects on pain intensity and recurrence of RAS, but further research is needed to confirm its efficacy.

Knowledge, attitudes, beliefs and practices of construction workers towards tetanus vaccine in Northern Italy

Construction workers (CWs) are both more exposed to tetanus and at higher risk to be inadequately immunized. Our aim was to evaluate tetanus immunization status and knowledge/attitudes towards tetanus vaccination in CWs in Italy. In this field report, the immunization status of 554 unskilled CWs (i.e. labourers). Immunization status was assessed recalling immunization booklets/certificates. Attitudes and knowledge were collected through a standardized questionnaire. In 240/554 CWs, immunization status was inadequate/not documented: in 184 subjects (33.2%), the last vaccination shot was older than 10 years, whereas basal immunization was incomplete in 20 cases, more frequently in foreign-born people (FBP) than in Italian born (IBP) (OR=7.116). In 198 cases (35.7%), an Occupational Physician (OPh) performed last booster, usually with monovalent (T, n=173) vaccine. The main reason for inadequate immunization was having forgotten the periodic booster (148/554; 26.7%), whereas 42 subjects (7.6%) deliberately avoided tetanus vaccine because of personal/religious beliefs, more frequently in FBP than in IBP (OR=3.182). In summary, the prevalence of inadequate immunization status was relatively high (43.4%): the high prevalence of "forgotten boosters" enlightens the key role of OPh in recalling and promoting vaccination policies. Moreover, the inappropriate use of Td vaccine points out the opportunity for educational campaigns in OPh.

Impact of a physician recommendation

HPV vaccination has failed to achieve uptake comparable to the other adolescent-specific vaccines. Gargano et al. conducted a survey of parents of adolescents in a single Georgia county and found uptake similar to national surveys. They also found among the most commonly cited reasons for receiving vaccines a recommendation from a health care provider and among the most commonly cited reasons for not getting any of the adolescent vaccines were concerns for adverse effects. Of note, they found that the recommendation for any one vaccine had a positive effect on the uptake of other vaccines. Their findings of the importance of provider recommendations matched findings from other studies of adolescent vaccines, infant vaccines, and adult vaccines. This is despite flaws in their study including a very poor response rate (effectively 4.5%) of those surveyed and in their reporting including a lack of details of survey methods. Local surveys of vaccination have much to offer the national and local discussion about immunization delivery and how delivery should be optimized, but such surveys should use standardized approaches as well as pursue more comprehensive investigations at the local level to address the nuances national complex-cluster surveys cannot.