Amenorrhoea is a symptom with many potential causes. Primary amenorrhoea (menstrual cycles never starting) may be caused by developmental problems such as the congenital absence of the uterus, failure of the ovary to receive or maintain egg cells. Also, delay in pubertal development will lead to primary amenorrhoea.
Diseases transmitted by mosquitoes include: malaria, dengue, West Nile virus, chikungunya, yellow fever, filariasis, Japanese encephalitis, Saint Louis encephalitis, Western equine encephalitis, Eastern equine encephalitis, Venezuelan equine encephalitis, La Crosse encephalitis and Zika fever.
Mosquitoes become infected by feeding on a person already infected with the virus. Infected mosquitoes can then spread the virus to other people through bites. Chikungunya virus is spread by Aedes aegypti and Aedes albopictus mosquitoes which are the same mosquitoes that transmit dengue and Zika viruses. These mosquitoes bite during the day and also at night.