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Immunological response in HIV-positive patients vaccinated against tick-borne encephalitis
B Panasiuk1, D Prokopowicz, A Panasiuk
1Dept of Infectious Diseases, Medical Academy of Bialystok, Zurawia Str 14, PL-15-540 Bialystok, Poland. apanasiuk@wp.pl
Background:
Vaccination against infectious diseases is a recommended preventive measure in patients with impaired immunity. The aim of the study was to estimate the immunogenicity of the vaccine against tick-borne encephalitis (TBE) in HIV-infected patients and to determine its safety for this group.
Patients And Methods:
The TBE vaccine FSME-IMMUN-inject was tested on 29 HIV-positive patients and the response compared to that of 40 healthy controls. The vaccination protocol for the HIV-positive group was modified by the addition of a fourth dose according to a 0/1/2/9-month schedule.
Results:
No serious adverse reactions were observed in patients with deficient immunity. A better response was obtained in HIV-infected patients with CD4 counts >or= 500/microl (55% of the patients had levels of IgG antibody > 126 VIEU/microl) than in those with CD4 counts of 200-499/microl (40%). However, the difference did not reach significance. 85% of healthy controls achieved protective antibody titers after a full course of vaccination.
Conclusion:
The correlation between post-vaccine seroconversion and CD4 lymphocyte count showed that the FSME-IMMUN-inject vaccine can be considered to be a CD4 cell-independent vaccine. The examinations carried out 1 year after the completed vaccination protocol showed maintenance of the anti-TBE response acquired after the third vaccination in healthy subjects and in HIV-infected patients.