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.
The World Health Organisation estimates that 725,000 people are killed each year by mosquito-born diseases. A staggering 200 million people are at least temporarily incapacitated by malaria alone, of which 600,000 die. Dengue fever, yellow fever and encephalitis are also deadly diseases carried by mosquitoes.