The potential risk of Schistosoma mansoni transmission by the invasive freshwater snail Biomphalaria straminea in South China

PLoS Neglected Tropical Diseases
DaTao LinXi Sun

Abstract

Schistosomes infect more than 200 million people worldwide, and globally, over 700 million people are at risk of infection. The snail Biomphalaria straminea, as one of the intermediate hosts of Schistosoma mansoni, consecutively invaded Hong Kong in 1973, raising great concern in China. In this study, a malacological survey was conducted over a period of four years, and investigations were performed on the mechanism of susceptibility of B. straminea to S. mansoni. B. straminea was investigated in China from 2014 to 2018. Out of 185 investigated sites, 61 were positive for stages of black B. straminea (BBS), which shows pigmented spots. Twenty of the 61 sites were positive for red B. straminea (RBS), which is partially albino and red colored. Phylogenetic analyses based on cox1 and 18S rRNA sequences demonstrated that both phenotypes were clustered with Brazilian strains. No S. mansoni infections were detected in field-collected snail. However, in laboratory experiments, 4.17% of RBS were susceptible to a Puerto Rican strain of S. mansoni, while BBS was not susceptible. The highest susceptibility rate (70.83%) was observed in the F2 generation of RBS in lab. The density of RBS has increased from south to north and from west to e...Continue Reading

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Datasets Mentioned

BETA
MF155555-MF155567

Methods Mentioned

BETA
PCR
electrophoresis
RNA Assay
RNASeq

Software Mentioned

SPSS
TopHat2
RNASeq by Expectation Maximization ( RSEM
FraserQC
GraphPad Prism
GraphPad
cBot Cluster Generation System
Bowtie2
MEGA7

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