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Toxoplasmosis is a widespread zoonotic disease caused by the parasitic protozoan Toxoplasma gondiL Maintenance of T.gondii in nature and modes of transmission to warm-blooded hosts are poorly known.This study evaluated the role of ticks in the epidemiology of toxoplasmosis.PCR analysis demonstrated the presence of T.gondii DNA in the hard tick,Haemaphysalis longicornis,at frequencies of 11.25%and 5.95%in adults and nymphs respectively.The dynamic amount changes of T.gondii in the tick body and its infectivity were studied by microinjection of green fluorescence parasites.Results showed the T.gondii can survive and remain infective in the tick body for at least 15 days.Under laboratory conditions,ticks were infected with T.gondii after taking blood from infected mammal hosts.Blood feeding of infected ticks did not transmit T.gondii to hosts;however,ingestion of infected ticks may be a route of T.gondii transmission between ticks and other common hosts.T.gondii infection in ticks could serve as a reservoir for toxoplasmosis transmission.