NATS 1670 Lecture Notes - Hematopoietic Stem Cell, Rotavirus, Uracil
6 May 2013
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In mutualism both organisms benefit from the interaction ie. humans and intestinal bacteria, humans lack nutrients which are provided by the bacteria living in the intestine. Commensal relationships are one-sided; one organism benefits the other does not ie. a spider builds a web on a plant and receives shelter but does not harm the plant. Tuberculosis, is a bacterial infection where when the host is infected, they stay alive for apx. 30 years, coughing and spreading the harmful microbe to others. It stays and infects the host for apx. 7 years without showing signs or symptoms allowing the disease to be transmitted. This may result in full-blown aids causing death: tb and hiv are two examples of very successful pathogens in humans. Most patients with active tb have pulmonary symptoms including productive cough, hemoptysis, chest pain and irregular lung sounds. More strains of tb are becoming more resilient to the use of drugs as treatment.
