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.
Transmission of Yellow Fever Virus: Infected Mosquito. Transmission of the yellow fever virus occurs in two main ways: urban (mosquito bites an infected human) and sylvatic (mosquito bites an infected monkey). Urban. Urban yellow fever transmission occurs when a mosquito bites an infected human. Once infected, this mosquito can then bite and infect another human.