What is the infectivity rate of polio?
The incubation period is approximately 7−10 days (range 4–35 days) and about 25% of infected individuals develop mild clinical symptoms including fever, headache and sore throat. Infected persons are most infectious from 7−10 days before and after the onset of symptoms.
What are the 3 types of polio?
There are three wild types of poliovirus (WPV) – type 1, type 2, and type 3.
What is the paralysis rate of polio?
About four to five percent of infected people have minor symptoms such as fever, muscle weakness, headache, nausea and vomiting. One to two percent of infected persons develop severe muscle pain and stiffness in the neck and back. Less than one percent of polio cases result in paralysis.
What is Type 2 polio?
cVDPV type 2 (cVDPV2) are the most prevalent, with 959 cases occurring globally in 2020. Notably, since the African Region was declared to have interrupted transmission of the wild poliovirus in August 2020, cVDPV are now the only form of the poliovirus that affects the African Region.
What countries still have polio 2020?
Wild poliovirus has been eradicated in all continents except Asia, and as of 2020, Afghanistan and Pakistan are the only two countries where the disease is still classified as endemic.
What does the polio virus do to your body?
Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus. The virus spreads from person to person and can infect a person’s spinal cord, causing paralysis (can’t move parts of the body).
What was the real cause of polio?
A virus called poliovirus causes polio. The virus enters the body through the mouth or nose, getting into the digestive and respiratory (breathing) systems. It multiplies in the throat and intestines. From there, it can enter the bloodstream.
When did they stop giving polio vaccine in us?
OPV was recommended for use in the United States for almost 40 years, from 1963 until 2000. The results have been miraculous: Polio was eliminated from the United States in 1979 and from the Western Hemisphere in 1991. Since 2000, only IPV is recommended to prevent polio in the United States.