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 parasite is transmitted to humans by the bite of infected female Anopheles species mosquitoes. The parasites multiply in the liver and the bloodstream of the infected person.The parasite may be taken up by another mosquito when it bites an infected person.alaria is caused by a parasite called Plasmodium. There are 5 species of Plasmodium which infect humans: 1  Plasmodium vivax. 2  Plasmodium falciparum. 3  Plasmodium malariae. 4  Plasmodium ovale. 5  Plasmodium knowlesi which is less common.