Table 4. Frequency of single vs multiple (2, 3 or 4) vertebrate blood types identified by PCR in T. infestans from Chuquisaca, Bolivia.

	Single	2	3	4	Likelihood ratio Chi Square	p-value*
Human	5	5	2	1	2.73	n.s.
Cow	2	5	2	0	5.78	<0.05
Chicken	4	10	3	1	13.29	<0.001
Pig	16	9	6	3	3.61	<0.05
Guinea Pig	1	1	3	2	6.64	<0.05
Goat	5	3	1	2	0.99	n.s.
Dog	3	11	7	3	32.74	<0.0001
Total**	36	22	8	3

^*Probability that vectors that fed on the specified host fed on more than one host (one-tailed test).

^**Total number is less than the column sum because of multiple infections.