Why are people in Developed Countries much less susceptible to TB than those in the Third World?

• Their immune systems are stronger due to their much higher living standard.
• Animals are tested for Bovine TB and the infected ones are culled..Milk is pasteurised.
• They are not in constant contact with TB infected people and animals.
• Good diet. There is almost no malnutrition in developed countries.
• Good Medical Services.
• Good living standard where indoor plumbing and heating are the norm.

Those at risk would be:

• Immigrants from countries with a high incidence of TB. They may only have been tested for pulmonary TB on entering the country, or, if they entered the country illegally they may not have been tested at all.
• Local people who are in a relationship with an immigrant from a country with a high incidence of TB.
• Homeless people. Ref: CDC Investigating Tuberculosis Outbreak in Homeless Community
• Intravenous drug users
• Recipients of blood transfusions
• Anyone who practices casual sex, especially oral and anal sex.
• Those who travel to Third World Countries with high TB incidence for sex holidays.