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.
Tornadoes are most common in the central part of the United States, known as the Great Plains.This area is suited to bring all of the ingredients together to forms tornadoes. More than 500 tornadoes typically occur in this area every year and is why it is commonly known as Tornado Alley.. Copyright 2009 WFMZ.All rights reserved. This material may not be published, broadcast, rewritten or redistributed.ore than 500 tornadoes typically occur in this area every year and is why it is commonly known as Tornado Alley.. Copyright 2009 WFMZ. All rights reserved.