"In Kenya and the Comoros, the vector of the was ', the previously reported to be involved in transmission in Africa and Asia. In contrast, in Reunion and Mauritius, , was the primary vector. The devastating outbreak resulted from a human–mosquito–human cycle that, as in dengue, did not require an external nonhuman reservoir. A. albopictus is also prevalent in Mayotte and Madagascar, but it is unclear which vector was involved in most islands of the Comorian archipelago, where studies have not been conducted or are ongoing. There is recent evidence that the outbreak in India, where A. aegypti is the primary species of mosquito, was caused by the new variant of the virus. ... A. albopictus is generally considered to have a lower vector capacity for arboviruses than A. aegypti. Specific mosquito populations, however, may have a high vector capacity, ... as suggested by a massive outbreak of dengue that was propagated by A. albopictus in Reunion in 1977. It is also possible that the strain of chikungunya virus in the Indian Ocean became better adapted to the A. albopictus vector."