Ebola is introduced into the human population through close contact with infected organisms. Which one of the following, however, cannot be the one ?

While chimpanzees, fruit bats, and monkeys are known to be susceptible to Ebola infection and have been identified as potential sources for introducing the virus to humans (either as reservoir hosts like fruit bats or through contact with infected animals via bushmeat consumption), mosquitoes are not involved in the transmission cycle of the Ebola virus.