Biomphalaria glabrata in Haiti.

Area of Science:

• Malacology
• Infectious Diseases
• Parasitology
• Ecology

Background:

• Biomphalaria glabrata is the primary intermediate host for Schistosoma mansoni, the causative agent of schistosomiasis.
• The snail was first documented in Haiti in 1891 in the Nord department and later in 1977 in another watershed.
• Understanding the distribution of B. glabrata is crucial for schistosomiasis control programs in endemic regions.

Purpose of the Study:

• To update the known distribution of Biomphalaria glabrata in Haiti.
• To assess the current distribution patterns of B. glabrata along the north coast.
• To explore potential factors influencing the snail's distribution, including interspecific competition.

Main Methods:

• Field surveys were conducted to identify new locations of Biomphalaria glabrata.
• Geographic distribution data were compiled and analyzed.
• Potential ecological factors, such as the presence of competitor snail species, were considered.

Main Results:

• Two new locations and one possible additional site for B. glabrata were identified on separate watersheds.
• A wide but discontinuous distribution of B. glabrata on Haiti's north coast was confirmed.
• No autochthonous infections with Schistosoma mansoni were reported in the surveyed areas.

Conclusions:

• The current distribution of B. glabrata in Haiti is confirmed to be wide but discontinuous and not actively expanding.
• The competitor snail Thiara granifera may play a role in shaping the distribution of B. glabrata.
• Further research is needed to fully elucidate the ecological interactions and their impact on disease transmission.