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.
Tornado Alley: The Most Tornado Prone Region in the World. Tornado Alley is a name for the area of the United States (and Canada) where tornadoes are most likely to occur.ornadoes can occur anywhere thunderstorms can occur on a frequent basis, such as Australia, Bangladesh, Canada, Germany, and the United Kingdom. The United States, with over 1,200 tornadoes per year, enjoys the most prolific supercell and tornadic environment in the world.