NDLI: Elimination of Angiostrongylus costaricensis larvae in feces from experimentally infected Swiss mice: circadian rhythm and correlation with survival

Content Provider	Springer Nature Link
Author	Azevedo, Graciele Vivian Rodriguez, Rubens Porto, Sérgio Machado Graeff Teixeira, Carlos Fornari, Fernando
Copyright Year	2010
Abstract	Angiostrongylus costaricensis is a nematode which harbors mesentery arteries of rodents. In these animals, a circadian rhythm of elimination of first-stage larvae (L1) and a relation between the amount of L1 in feces and survival are unknown. We assessed fecal elimination of A. costaricensis L1 from experimentally infected Swiss mice and tried to correlate L1 elimination with survival. Thirteen Swiss mice were infected by gavage with ten A. costaricensis L3 larvae obtained from Phyllocaulis slugs. Feces were weighed at 7 a.m. and 7 p.m. starting from the 24th day post-infection until animal death. Feces sediment was examined in microscope for L1 counting. The mice were dead after a period ranging 19–61 days post-infection. Compared to diurnal samples, both feces’ weight (2.3 ± 0.7 vs. 1.8 ± 0.5 g; P < 0.0001) and L1 total count [median 1,950 vs. 1,250; P = 0.015] were higher in feces eliminated at night. No difference was observed between diurnal and nocturnal elimination when counting L1 by gram of feces (725 vs. 650 L1/g; P = 0.821). A significant correlation was observed between survival and total number of L1 in feces (r = 0.84; P = 0.0007). This study suggests that mice experimentally infected with A. costaricensis eliminate more L1 at night due to higher fecal volume at this period. The correlation between number of L1 in feces and survival suggests a phenomenon of tolerance to A. costaricensis infection in mice with longer survival.
Starting Page	537
Ending Page	540
Page Count	4
File Format	PDF
ISSN	09320113
Journal	Parasitology Research
Volume Number	108
Issue Number	3
e-ISSN	14321955
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-10-05
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Immunology Medical Microbiology Microbiology
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Veterinary Parasitology Insect Science

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