transmission threshold (medicine) and opisthotonus (medicine)

transmission threshold (medicine)

transmission threshold
<epidemiology> Occurs for a parasite when the basic reproductive rate Ro is equal to 1. Below this threshold level the disease is unable to maintain itself within the host population. Typically, for directly transmitted parasites there is a transmission threshold for the host population size.

opisthotonus (medicine)

opisthotonus
Spasm of the body where the head and heels are bent backward and the body is bowed forward. A type of extrapyramidal effect.

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