Partridges (Perdix perdix), chukars (Alectoris chukar), wild guineafowl (Nu
mida meleagris), wild turkeys (Meleagris gallopavo) and chickens (Gallus do
mesticus) were inoculated per os with 10(3) or 10(5) Toxoplasma gondii oocy
sts (K7 strain). Two of five partridges fed 10(3) oocysts and six of eight
partridges fed 10(5) oocysts died between day 6 and 16 post-inoculation (p.
i.); no clinical symptoms were observed in surviving birds. Antibodies to T
. gondii were detected in the birds by the indirect fluorescence antibody t
est (IFAT) first on day 7 p.i. On days 14, 21 and 28 p.i. (end of the exper
iment), antibodies were found in all partridges, chukars, guineafowl and tu
rkeys. In chickens, IFAT antibodies were first detected on day 14 p.i., and
all chickens were serologically positive on days 21 and 28 p.i. Bioassay i
n mice revealed T. gondii in the brain, liver, spleen, heart and leg muscle
s of all partridges and chukars. Enteritis was the most striking lesion in
partridges that died. Results indicated that partridges are highly suscepti
ble to toxoplasmosis, while chukars, wild guineafowl and turkeys seem to be
less susceptible. Chickens are highly resistant to T. gondii infections.