Prevalence of antibodies to Vaccinia virus after smallpox vaccination in Italy.
Decades after smallpox was eradicated and vaccination discontinued, the level of residual immunity in today's population is largely unknown. This study describes an epidemiological assessment in Italians of antibodies against the intracellular mature virus (IMV) and extracellular envelope virus (EEV) forms of Vaccinia virus. Serum samples (n = 642) were taken in 1993 and 2003 from people between 11 and 102 years old. Most citizens >27 years old were positive for antibodies to IMV and EEV. These antibodies were long-lasting and similar titres were present in citizens between 30 and 100 years old. Serum samples from 1993 and 2003 displayed very similar EEV- and IMV-specific antibody titres. By using these data and demographic considerations, it was predicted that, in 2003, 46 % of the Italian population were positive for both IMV and EEV, 42 % were negative for both and 12 % were positive for one antigen.
Pütz
Mike M
MM
Department of Virology, Faculty of Medicine, Imperial College London, St Mary's Campus, London W2 1PG, UK.
Alberini
Isabella
I
Department of Physiopathology, Experimental Medicine and Public Health, University of Siena, Via A. Moro, 53100 Siena, Italy.
Midgley
Claire M
CM
Department of Virology, Faculty of Medicine, Imperial College London, St Mary's Campus, London W2 1PG, UK.
Manini
Ilaria
I
Department of Physiopathology, Experimental Medicine and Public Health, University of Siena, Via A. Moro, 53100 Siena, Italy.
Montomoli
Emanuele
E
Department of Physiopathology, Experimental Medicine and Public Health, University of Siena, Via A. Moro, 53100 Siena, Italy.
Smith
Geoffrey L
GL
Department of Virology, Faculty of Medicine, Imperial College London, St Mary's Campus, London W2 1PG, UK.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000914:Antibodies, Viral / Q000097:blood* / Q000276:immunology*; D000918:Antibody Specificity; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D007558:Italy / Q000453:epidemiology; D008875:Middle Aged; D012899:Smallpox / Q000517:prevention & control*; D012900:Smallpox Vaccine / Q000008:administration & dosage* / Q000276:immunology; D013997:Time Factors; D014616:Vaccinia virus / Q000276:immunology* / Q000472:pathogenicity; D012901:Variola virus / Q000276:immunology* / Q000502:physiology; D014779:Virus Replication
D000914:Antibodies, Viral; D012900:Smallpox Vaccine