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.
More about the power of tornadoes: 1  Tornado Alley encompasses the eastern section of South Dakota, eastern Colorado, Nebraska, Kansas, Oklahoma and northern Texas. 2  One of the deadliest tornadoes in recorded history was the Tri-State Tornado of 18 March 1925. The tornado traveled a total of 219 miles, killing 695 people in Illinois, Missouri and Indiana. Although Oklahoma City holds the record for the most tornadoes, tiny Codell, Kansas, holds the distinction of being struck on the same date for three consecutive years, with tornadoes occurring on 20 May of 1916, 1917 and 1918.