In some cases, these vaccines use epitopesâthe very specific parts of the antigen that antibodies or T cells recognize and bind to. Because subunit vaccines contain only the essential antigens and not all the other molecules that make up the microbe, the chances of adverse reactions to the vaccine are lower.
Tornadoes occur in many parts of the world, including Australia, Europe, Africa, Asia, and South America. Even New Zealand reports about 20 tornadoes each year. Two of the highest concentrations of tornadoes outside the U.S. are Argentina and Bangladesh.
Generally, tornado alley is a region of the United States more prone to experiencing tornadoes. Specifically this region is found in northern Texas, Oklahoma, eastern Colorado and Kansas, central and eastern Nebraska and the eastern half of South Dakota. However, tornadoes do not discriminate.