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If TB bacteria gain entry to the blood stream from an area of damaged tissue, they can spread throughout the body and set up many foci of infection, all appearing as tiny, white tubercles in the tissues. [96] This severe form of TB disease, most common in young children and those with HIV, is called miliary tuberculosis. [97]
In addition, TB spread via humans on the trade routes of the Old World. Other researchers have argued there is other evidence that suggests the tuberculosis bacteria is older than 6,000 years. [ 1 ] This TB strain found in Peru is different from that prevalent today in the Americas, which is more closely related to a later Eurasian strain ...
[21] [22] According to the World Health Organization, approximately 10 million new TB infections occur every year, and 1.5 million people die from it each year – making it the world's top infectious killer (before COVID-19 pandemic). [21] However, there is a lack of sources which describe major TB epidemics with definite time spans and death ...
Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
Also, the IGRA is more specific to TB rather than other types of mycobacterial infections and is unlikely to be positive as a result of having BCG vaccine in the past, a vaccine that protects against TB. And this is a pretty useful feature of IGRAs, since BCG vaccine is given to many children around the world to prevent disseminated TB.
Mycobacterium tuberculosis (M. tb), also known as Koch's bacillus, is a species of pathogenic bacteria in the family Mycobacteriaceae and the causative agent of tuberculosis. [1] [2] First discovered in 1882 by Robert Koch, M. tuberculosis has an unusual, waxy coating on its cell surface primarily due to the presence of mycolic acid.
Prospects for tuberculosis control and elimination in a hypothetical high-burden country, starting in 2015. Tuberculosis has been a curable illness since the 1940s when the first drugs became available, although multidrug-resistant and extensively drug-resistant TB present an increasing challenge. [5]
2006: Actions for life – Towards a world free of TB; 2007: TB anywhere is TB everywhere; 2008–2009: I am stopping TB; 2010: Innovate to accelerate action; 2011: Transforming the fight towards elimination; 2012: Call for a world free of TB; 2013: Stop TB in my lifetime; 2014: Reach the three million: A TB test, treatment and cure for all