| assessing infections at multiple levels of aggregation. | the patterns of sero-prevalence of antibodies to four infectious diseases, representing a broad range of pathogens (bacteria: brucellosis; mycoplasma: contagious bovine pleuropneumonia; viruses: infectious bovine rhinotracheitis; protozoa: trypanosomosis) were investigated at three levels of organization (farm, area and district). three contrasting districts in kenya were compared: an arid and pastoral area (samburu); a tropical highland area (kiambu), and a tropical coastal area (kilifi). cattl ... | 1997 | 9234402 |
| a comparison of different models for assessing variations in the sero-prevalence of infectious bovine rhinotracheitis by farm, area and district in kenya. | the relative variability of the sero-prevalence of antibodies to infectious bovine rhinotracheitis (ibr) due to cow, farm, and agroecological area levels were investigated for three contrasting districts in kenya: samburu, an arid and pastoral area; kiambu, a tropical highland area; and kilifi, a typical tropical coastal area. cattle were selected by two-stage cluster sampling and visited once between august 1991 and 1992. data on animal, farm, and area factors were analyzed using schall's algor ... | 1997 | 9443329 |