Background
Non-human primates are often infected with human-pathogenic
Cryptosporidium hominis
subtypes, but rarely with
Cryptosporidium parvum
. In this study, 1452 fecal specimens were collected from farmed crab-eating macaques (
Macaca fascicularis
) in Hainan, China during the period April 2016 to January 2018. These specimens were analyzed for
Cryptosporidium
species and subtypes by using PCR and sequence analysis of the
18S
rRNA and 60 kDa glycoprotein (
gp60
) genes, respectively.
Results
Altogether,
Cryptosporidium
was detected using
18S
rRNA-based PCR in 132 (9.1%) sampled animals, with significantly higher prevalence in females (12.5% or 75/599
versus
6.1% or 43/706), younger animals (10.7% or 118/1102 in monkeys 1–3-years-old
versus
4.0% or 14/350 in those over 3-years-old) and animals with diarrhea (12.6% or 46/365
versus
7.9% or 86/1087). Four
Cryptosporidium
species were identified, namely
C. hominis
,
C. parvum
,
Cryptosporidium muris
and
Cryptosporidium ubiquitum
in 86, 30, 15 and 1 animal, respectively. The identified
C. parvum
,
C. hominis
and
C. ubiquitum
were further subtyped by using
gp60
PCR. Among them,
C. parvum
belonged to subtypes in two known subtype families, namely IIoA14G1 (in 18 animals) and IIdA19G1 (in 2 animals). In contrast,
C. hominis
mostly belonged to two new subtype families Im and In, which are genetically related to Ia and Id, respectively. The
C. hominis
subtypes identified included ImA18 (in 38 animals), InA14 (in six animals), InA26 (in six animals), InA17 (in one animal) and IiA17 (in three animals). The
C. ubiquitum
isolates belonged to subtype family XIId. By subtype, ImA18 and IIoA14G1 were detected in animals with diarrhea whereas the remaining ones were mostly found in asymptomatic animals. Compared with
C. parvum
and
C. muris
, higher oocyst shedding intensity was observed in animals infected with
C. hominis
, especially those infected with the Im subtype family.
Conclusions
Data from the study suggest that crab-eating macaques are infected with diverse
C. parvum
and
C. hominis
subtypes. The
C. parvum
IIo subtype family previously seen in rodents in China has apparently expanded its host range...