Short answers, pulled from the story.
Robert Koch discovered the bacterium that causes tuberculosis on the 24th of March 1882. This discovery marked a turning point in the understanding of the disease, although experts initially attributed it to heredity or moral failings.
A disease can exist within the body for years without symptoms, a state known as subclinical or silent disease, whereas predisease refers to conditions like prehypertension or prediabetes that create a boundary between preventive measures and over-medicalization. Identifying a high risk for progression to disease must be weighed against the potential harm of interventions that may have a poor benefit-to-cost ratio.
The impact of a health problem is measured by financial cost, mortality, morbidity, and indicators such as the disability-adjusted life year. In 2004, the World Health Organization calculated that 1.5 billion disability-adjusted life years were lost to disease and injury.
The most known and used classification of diseases is the World Health Organization's ICD, with the last publication being the ICD-11. Diagnostic terms often only reflect a symptom or set of symptoms, known as a syndrome, when cause or pathogenesis are unknown.
Sickness confers a specific social role known as the sick role, which legitimizes benefits such as illness benefits, work avoidance, and the right to be looked after by others. The person who is sick is obligated to seek treatment and work to become well once more.