MEDICINE
INFECTIOUS DISEASES
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Detailed explanation-1: -The natural history of a disease classifies into five stages: underlying, susceptible, subclinical, clinical, and recovery/disability/death.
Detailed explanation-2: -Illness. The third stage of infection is an illness or clinical disease. This stage includes the time when a person shows apparent symptoms of an infectious disease.
Detailed explanation-3: -The five periods of disease (sometimes referred to as stages or phases) include the incubation, prodromal, illness, decline, and convalescence periods (Figure 12.2. 1). The incubation period occurs in an acute disease after the initial entry of the pathogen into the host (patient).
Detailed explanation-4: -There are four stages of syphilis (primary, secondary, latent, and tertiary). Each stage has different signs and symptoms.
Detailed explanation-5: -Infectious diseases. Infectious diseases are caused by microorganisms, such as viruses, bacteria, fungi, or protozoa, that invade the body, attack the immune system and multiply. Genetic Diseases. Metabolic diseases. External diseases. WHO classification of disease. 11-Jan-2023