Table 1.

Grouping and treatment of principal cats

Group	Tick exposure	Number of cats
Group 1	12 h infestation	7
Group 2	18 h infestation	7
Group 3	24 h infestation	7
Group 4	36 h infestation	7
Group 5	48 h infestation	7
Group 6	Ingestion of ticks	7
Group 7	Fed to repletion	7