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An infection is the invasion of tissues by pathogens, ... Note: Other causes of death include maternal and perinatal conditions (5.2%), nutritional deficiencies (0.9%),
Pathogenesis is a qualitative description of the process by which an initial infection causes disease. [2] Viral disease is the sum of the effects of viral replication on the host and the host's subsequent immune response against the virus. [ 3 ]
Mycobacterium tuberculosis is a species of bacteria that causes tuberculosis, a respiratory infection. [13] Pseudomonas aeruginosa is a bacterium that can cause respiratory infections. It is frequently associated with cystic fibrosis and hospital-acquired infections. [14] Salmonella is a genus of bacteria, known to cause gastrointestinal ...
A urinary tract infection (UTI) is an infection that affects a part of the urinary tract. [1] Lower urinary tract infections may involve the bladder (cystitis) or urethra while upper urinary tract infections affect the kidney (pyelonephritis). [10]
HIV seeks out and destroys CCR5 expressing CD4 + cells during acute infection. A vigorous immune response eventually controls the infection and initiates the clinically latent phase. However, CD4 + T cells in mucosal tissues remain depleted throughout the infection, although enough remain to initially ward off life-threatening infections.
Bacteremia can travel through the blood stream to distant sites in the body and cause infection (hematogenous spread). Hematogenous spread of bacteria is part of the pathophysiology of certain infections of the heart (endocarditis), structures around the brain , and tuberculosis of the spine (Pott's disease).
When the infection is acute (recent onset, instead of chronic), heterophile antibodies are produced. [26] Cytomegalovirus, adenovirus and Toxoplasma gondii (toxoplasmosis) infections can cause symptoms similar to infectious mononucleosis, but a heterophile antibody test will test negative and differentiate those infections from infectious ...
An upper respiratory tract infection (URTI) is an illness caused by an acute infection, which involves the upper respiratory tract, including the nose, sinuses, pharynx, larynx or trachea. [ 3 ] [ 4 ] This commonly includes nasal obstruction, sore throat, tonsillitis , pharyngitis , laryngitis , sinusitis , otitis media , and the common cold .