Which statement about the distribution of type B tularemia is true?

Which statement about the distribution of type B tularemia is true?

• A. Found On All Continents
• B. Found Only In Asia
• C. Found Only In Europe
• D. Found Only In North America

Answer: (A)

Type B tularemia, caused by Francisella tularensis subsp. holarctica, has a broad geographic footprint compared with the Type A strain. While Type A is largely confined to North America, Type B has been documented in Europe, Asia, and North America, giving it a presence across multiple continents. This wide distribution comes from its ability to persist in a variety of environments, hosts, and vectors, such as ticks and small mammals, across different regions. Because of this substantial and widespread reach, the statement describing Type B as being found on all continents best captures its distribution. The more region-specific options don’t fit as well since Type B is not restricted to a single region.

Type B tularemia, caused by Francisella tularensis subsp. holarctica, has a broad geographic footprint compared with the Type A strain. While Type A is largely confined to North America, Type B has been documented in Europe, Asia, and North America, giving it a presence across multiple continents. This wide distribution comes from its ability to persist in a variety of environments, hosts, and vectors, such as ticks and small mammals, across different regions. Because of this substantial and widespread reach, the statement describing Type B as being found on all continents best captures its distribution. The more region-specific options don’t fit as well since Type B is not restricted to a single region.