Tuesday, February 11, 2014

TUBERCULOSIS-ITS JOURNEY IN THE LIVES OF MANKIND

The ancient Greek literature mentions of a disease called “Phthisis”. Hippocrates described the disease as the most common illness of his time, typically affecting young adults and nearly always fatal. While Hippocrates thought Phthisis to be hereditary in nature, Aristotle believed it was contagious.
Some authors described tuberculosis as the first disease known to mankind. It appears likely that Akhenaten, the Pharaoh of the Eight Dynasty of Egypt and his wife Nefertiti both died of tuberculosis. Evidence indicates that hospitals for tuberculosis existed in ancient Egypt as early as 1500 B.C.

The Old Testament mentions of a consumptive illness that would affect the Jewish people if they stray from God. It is listed in the section of curses given before they enter the land of Cannan.

The oldest of the Vedas, Rigveda called it Yaksma. The Atharvaveda called it Balasa.

Fransicus Sylvius, Dutch physician recognized that skin ulcers caused by scrofula resembled tubercles seen in phthisis and in his book ‘Opera Medica’ described phthisis as the ‘scrofula of the lungs’.
In the 17th century, the tuberculosis epidemic hit Europe for 2 decades and it was known as the “Great White Plague”. It was seen as a romantic disease. Suffering from the disease was believed to bestow upon the sufferer heightened sensitivity. British poet Lord Byron wrote “I should like to die of consumption.” helping to popularize the disease as the disease of artists. George Sand described her lover Fredrick Chopin’s illness as “Chopin coughs with infinite grace.” Shakespeare also mentioned of a disease called “Consumption” in his play “Much Ado about nothing” and another called “Scrofula” in “Macbeth”.

Rene Laennec who invented stethoscope died of tuberculosis. He used the stethoscope to corroborate his auscultatory findings and respiratory symptoms with the autopsy findings of lung lesions of patients who died of TB.
 Robert Koch demonstrated that the disease was caused by an infectious agent, Mycobacterium Tuberculosis. He made this public at the Physiological Society of Berlin on 24 March 1882 in a famous letter entitled “Uber Tuberculose”. March 24 has ever since been known as the World Tuberculosis Day.

On April 20, 1882, Robert Koch demonstrated that Mycobacterium was the single cause of tuberculosis in all its forms. In 1890, Koch developed tuberculin, a purified protein derivative of the bacteria. In 1908, Charles Mantoux demonstrated it to be an effective intradermic test for diagnosing tuberculosis.

In 1895, Wilhelm Konrad Von Roentgen discovered X-ray which made doctors possible to observe the presence and the progress of the disease.

In 1902, the international conference on tuberculosis in Berlin proposed the ‘Cross of Lorraine’ to be the international symbol of the fight against tuberculosis. The Lorraine Cross was carried to the Crusades by the original Knight’s Templar, granted to them for their use by the Patriarch of Jerusalem. In the Catholic Church, an equal armed Lorraine Cross denotes the office of archbishop.

Albert Calmette and Camille Geurin discovered the BCG vaccine from attenuated bovine strains of tuberculosis. The vaccine was first used on humans in France in 1921.

Streptomycin discovered in 1944 became the first antibiotic effective against Mycobacterium Tuberculosis and its discovery marked the modern era of tuberculosis treatment. Soon after in 1952, Isoniazid was developed to become the first oral drug effective against Mycobacterium tuberculosis. Rifampicin followed in the 70s.

The possibility of the disease getting completely eliminated became visible on the horizon. However, the emergence of HIV, the development of resistance to drugs particularly Rifampicin and Isoniazid coupled with inadequate control programs let to resurgence of the disease.
60% of HIV +ve patients contract tuberculosis during their lifetime. Management requires therapy with both anti-tubercular as well as anti-retroviral drugs.

Multi-drug resistant TB (MDR-TB) and its more severe form extremely drug resistant TB (XDR-TB) is rocking the planet. Statistics on the quantum of drug resistance is still patchy but the trend is hard to refute. There are drugs that cure MDR-TB but it does not cure everybody. It takes a minimum of two years under the available regimen though trials are on, for shorter courses of treatment.

In a recent study published in the Lancet Respiratory Medicine journal, researchers said that more than half of 30 drug resistant TB patients treated with transfusion with their own bone-marrow stem cells were cured of drug resistant TB after 6 months. This may be another new ray of hope.
After a gap of 40 years, a new drug for treatment of tuberculosis was discovered. Bedaquiline, was approved under the accelerated approval programme of the FDA. The drug demonstrated the potential to fill an unmet medical need, has the potential to provide effective treatment where no satisfactory alternative therapy exist particularly in some cases of MDR and XDR tuberculosis. However, the drug also carries a “Black-box warning” of possible fatal cardiac arrhythmias.

Today, we are at the cross-road of elimination of this age-old disease during our life-time and million more TB deaths. The concept of “Universal Access” calls for all health-care professionals to deliver his maximum towards tuberculosis control.

The cost of inaction can be high, failure to roll out the tools that we have, can be disastrous.