Epidemiology and Infection

Research Article

The carriage of Streptococcus suis type 2 by pigs in Papua New Guinea

R. A. Patersona1, I. D. Robertsona1 c1, R. C. Sandersa2, P. M. Sibaa2, A. Clegga2 and D. J. Hampsona1

a1 School of Veterinary Studies, Murdoch University, Perth, 6150, Australia

a2 Institute of Medical Research, Goroka, Eastern Highlands Province, Papua New Guinea

Abstract

An indirect fluorescent antibody test was used to detect the presence of Streptococcus suis type 2 in nasal and pharyngeal swabs taken from pigs in Papua New Guinea. The rate of carriage for the two sites in domesticated indigenous village pigs was 0·5 and 2·5% respectively, compared to 39 and 43% for intensively reared pigs. These findings were supported by the results of a serological survey, using an enzyme linked immunosorbent assay, in which 87% of intensively reared pigs but only 8% of village pigs were seropositive to S. suis type 2.

It is proposed that in intensive piggeries S. suis type 2 is continually cycled between pigs. In village pigs, the low population density and harsh environmental conditions prevents this cycle of infection.

(Accepted September 01 1992)

Correspondence:

c1 I. D. Robertson, School of Veterinary Studies, Murdoch University. Perth, 6150, Western Australia.

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