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Table 2 Degree of parasite aggregation measured by the negative binomial dispersion index, k

From: Over-dispersed Trypanosoma cruzi parasite load in sylvatic and domestic mammals and humans from northeastern Argentina

Host species

Number of hosts

Parasite load (Pe/ml)

k

Mean

Variance

Didelphis albiventris

13

43.3

3825.3

0.3

Dasypus novemcinctus

9a

157.3

66,050.9

0.4

Dogs

70

22.9

2612.7

0.5

Cats

13

121.6

90,505.9

0.3

Humans

88

0.4

0.6

5.1

  1. aOne D. novemcinctus with 8325 parasites/ml was considered to be an outlier and excluded from analysis