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.
Ticks commonly carry disease-causing bacteria, parasites and viruses. Bites from these spider-like pests often transmit infectious diseases to humans. Tick-borne illnesses include Rocky Mountain spotted fever, Lyme disease, ehrlichiosis, babesiosis, Colorado tick fever, Southern tick-associated rash illness, relapsing fever and Q fever. Each of these diseases causes a range of flu-like symptoms, which can confound diagnosis.