Serum antibody titres to canine distemper virus (cdv), canine parvovirus (cpv) and rabies were measured in dogs that had not been revaccinated annually and compared with the titres in a control group of regularly vaccinated animals; 83 per cent (171 of 207) of the dogs vaccinated against cdv one or more years earlier had serum neutralising antibody titres equal to or greater than 16; 64 per cent (136 of 213) of the dogs vaccinated against cpv one or more years earlier had haemagglutination inhibiting titres equal to or greater than 80; and 59 per cent (46 of 78) of the dogs vaccinated against rabies two or more years earlier had serum neutralising antibody titres equal to or greater than 0·5 iu/ml. Three weeks after a single booster vaccination the dogs' antibody titres against cdv had increased above the threshold level in 94 per cent of the dogs, against cpv in 68 per cent, and against rabies in 100 per cent.
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