Psittacosis known serovars. All should be considered to be readily transmissible to humans. "C. psittaci" serovar A is endemic among psittacine birds and has caused sporadic zoonotic disease in humans, other mammals, and tortoises. Serovar B is endemic among pigeons, has been isolated from turkeys, and has also been identified as the cause of abortion in a dairy herd. Serovars C and D are occupational hazards for slaughterhouse workers and for people in contact with birds. Serovar E isolates (known as Cal-10, MP, or MN) have been obtained from a variety of avian hosts worldwide, and although they were associated with
Derzsy's disease Derzsy's disease Derzsy's disease is caused by Anseriform dependoparvovirus 1, in the "Parvoviridae" family. It affects geese and Muscovy ducks. The virus is shed in the faeces and thus transmission is horizontal, via the direct faecal-oral route and also indirectly via fomites. Vertical transmission is also possible. Clinical disease only occurs in young geese and ducks between birth and 4–5 weeks of age. Several genotypes have been described. The genotype is based upon the sequence of the VP3 protein. Acute disease leads to death in most birds between the ages of 7–10 days. Clinical signs are quite limited in those