Tuberculosis is a contagious disease that usually attacks the lungs, but sometimes also other parts of the body, such as the kidneys, glands, and bones. In the past, tuberculosis was often fatal. Nowadays, treatment with antibiotics can cure it. For most healthy people, the risk of contracting TB is low. In Canada, approximately 1,600 new cases of tuberculosis reported annually, which is much less than at the beginning of the 20th century, when it was one of the leading causes of death in the country.
Although the disease is less frequent than it was, it remains a major public health problem in many parts of the world and killed 1.4 million people in 2010. On March 24, 1882, the German physician Robert Koch isolated the bacillus of Koch (or Mycobacterium tuberculosis), the bacterium responsible for tuberculosis, which has cohabited with humans for millions of years. This discovery earned him the Nobel Prize in medicine or physiology in 1905. The day of 24 March was declared World Tuberculosis Day by the World Health Organization (WHO).
There are three types of tuberculosis:
Some facts about the transmission of tuberculosis include:
Tuberculosis is part of the so-called “poverty diseases” because they spread mainly in environments where the following conditions exist:
It, therefore, persists in economically disadvantaged countries. According to the WHO, one-third of cases of tuberculosis are concentrated in the South-East Asia region (including Indonesia, Cambodia, Thailand, and Vietnam). Africa (especially in the sub-Saharan region) and the Middle East are closely following. These three regions of the globe account for 85% of all TB cases. In these countries, the incidence of tuberculosis in prisons is often 100 times higher than in the general population. Refugee camps are also a major problem. There are also endemic areas of tuberculosis in India, China, and Mexico.
In the West, the disease is more prevalent in disadvantaged areas, among Aboriginal people, homeless people, intravenous drug users, people with AIDS, and those born in a country where TB is common. In Canada, the emergence of strains of antibiotic-resistant bacteria and the increase in international travel have led to a resurgence of the disease in the 1990s. However, the number of cases has stabilized since the following decade.
Even if the disease does not manifest itself, its occurrence or activation of a “dormant” infection is more likely to occur in people whose immune systems are weakened for one of the following reasons:
Note: According to a study conducted in a Montreal hospital, about 8% of children admitted through international adoption are infected with the tuberculosis bacterium. Depending on the country of origin, a bacillus test may be recommended.
Basic Preventive Measures:
To be observed during the 2 or 3 weeks of treatment:
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