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.
You can prevent diseases caused by viruses, bacteria, and parasites by keeping a clean environment and by handling food in a sanitary manner. Most intestinal parasites are transmitted by contact with feces from an infected person or pet. Many viral, bacterial, and protozoan diseases are transmitted by insect bites from mosquitoes, flies, fleas, and ticks. 2  Diseases transmitted by mosquitoes include Dengue Fever, Malaria, Rift Valley Fever, Yellow Fever, and various types of viral encephalitis such as West Nile virus.