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.
How malaria is spread. The plasmodium parasite is spread by female Anopheles mosquitoes, which are known as 'night-biting' mosquitoes because they most commonly bite between dusk and dawn. If a mosquito bites a person already infected with malaria, it can also become infected and spread the parasite on to other people.here are many different types of plasmodium parasite, but only five types cause malaria in humans. These are: 1  Plasmodium falciparum â mainly found in Africa, it is the most common type of malaria parasite and is responsible for most malaria deaths worldwide.