Vaccine coverage, herd immunity and occurrence of canine distemper from 1990-1996 in Finland.
Official vaccine sales statistics, the development of the young dog population and the takes of available vaccines were used to calculate the vaccine coverage and herd immunity (HI) against canine distemper, endemic during 1990-1993 and epidemic in 1994-1995 in Finland. Despite the satisfactory vaccine coverage, HI was no more than 50-65% in 1990-1993 because low-take vaccines dominated the market. Replacement of the low-take with high-take vaccines in 1995 raised the HI to 90%, which coincided with the ending of the epidemic. In 1996, the HI was slightly above 70%, which was sufficient to control the disease despite infectious pressure caused by repeated imports.
Rikula
Ulla
U
Finnish Food Safety Authority, Evira, Animal diseases and Food Safety Research, Virology Unit, Mustialankatu 3, FI-00790 Helsinki, Finland. ulla.rikula@evira.fi
Nuotio
Lasse
L
Sihvonen
Liisa
L
D000818:Animals; D004216:Distemper / Q000453:epidemiology* / Q000276:immunology* / Q000517:prevention & control; D004217:Distemper Virus, Canine / Q000276:immunology*; D004283:Dog Diseases / Q000453:epidemiology* / Q000276:immunology* / Q000517:prevention & control; D004285:Dogs; D005387:Finland / Q000453:epidemiology; D012307:Risk Factors; D013997:Time Factors; D014765:Viral Vaccines / Q000276:immunology*
D014765:Viral Vaccines