Avian malaria parasites have been found in the blood of many populations, and birds in China were found to harbour a strain of H5N1 that was highly virulent to chickens.
Fågelmalariaparasiter har hittats i blodet hos många populationer, och fåglar i Kina har befunnits bära på en stam av H5N1 som var mycket virulent för kycklingar.