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.
This is why a burst of heavy rain or hail often precedes the tornado itself. Tornadoes are common in an area stretching from Texas to Iowa, the area known as Tornado Alley also covers Colorado, Nebraska, Illinois, Indiana, Missouri and Oklahoma.his is why a burst of heavy rain or hail often precedes the tornado itself. Tornadoes are common in an area stretching from Texas to Iowa, the area known as Tornado Alley also covers Colorado, Nebraska, Illinois, Indiana, Missouri and Oklahoma.