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Additional possible viral causes are arboviral flavivirus (St. Louis encephalitis, West Nile virus), bunyavirus (La Crosse strain), arenavirus (lymphocytic choriomeningitis virus), reovirus (Colorado tick virus), and henipavirus infections. [14] [15] The Powassan virus is a rare cause of encephalitis. [16]
A mother holding her son who was born with microcephaly due to vertically transmitted infection with Zika virus. Microcephaly (from Neo-Latin microcephalia, from Ancient Greek μικρός mikrós "small" and κεφαλή kephalé "head" [2]) is a medical condition involving a smaller-than-normal head. [3]
Other symptoms are less common among people with COVID-19. Some people experience gastrointestinal symptoms such as loss of appetite, diarrhea, nausea or vomiting. [1] [65] A June 2020 systematic review reported a 8–12% prevalence of diarrhea, and 3–10% for nausea. [2] Less common symptoms include chills, coughing out blood, diarrhea, and rash.
Cervical lymphadenitis is commonly caused by an infection of mycobacteria in the head region. This disease is very inconsistent; cases can have different laboratory findings. Sometimes the disease can occur due to tuberculosis disease.
Symptoms include headache, fever, nausea, vomiting, a stiff neck, confusion, hallucinations and seizures. [6] Symptoms progress rapidly over around five days with characteristics of both meningitis and encephalitis, making it a type of meningoencephalitis. Death usually results within one to two weeks of symptom onset. [6] [1]
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Symptoms occur anywhere from 1 to 8 weeks after exposure to the virus and come in three distinct phases. First, there is prodromal phase with flu-like symptoms such as fever, headache, muscle, shortness of breath, as well as low platelet count.
Head lice infestation, also known as pediculosis capitis, is the infection of the head hair and scalp by the head louse (Pediculus humanus capitis). [6] Itching from lice bites is common. [5] During a person's first infection, the itch may not develop for up to six weeks. [5] If a person is infected again, symptoms may begin much more quickly. [5]