| prevalence of chlamydia psittaci in the feral pigeon population of basel, switzerland. | feral pigeons (columba livia) are commonly infected with chlamydia psittaci, the agent of psittacosis in humans. to assess the zoonotic risk posed by feral pigeons in the urban environment, we examined the presence of the chlamydia psittaci outer membrane protein a (ompa) gene in pharyngeal and cloacal samples of 202 feral pigeons present in a loft in basel, switzerland. additionally, we examined 620 fresh faecal droppings of feral pigeons at 6 public sites in basel. the ompa gene of c. psittaci ... | 2011 | 21921110 |