差分

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==Definition==
*infections that are commonly transmitted by sexual activity
**health education
**contact tracing
 
 
<math>R_0 = B \times C \times D</math>
*<math>B</math>: transmission coefficient ←condoms, education
*<math>C</math>: mean rate of partner change ←
*<math>D</math>: mean duration of infectiousness ←

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