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**time
*susceptibility of person
*<math>R_0 \approx r \times c \times d</math>
**<math>r</math> = transmissibility
***to reduce <math>r</math>
****ealier detection
****rapid commencing of treatment
****reduce aerolization (surgical masks on patients)
*****surgical masks on patients reduce infectivity by 56%
**<math>c</math> = susceptibility of contacts
***to reduce <math>c</math>
****open windows
*****Tb airborne transmission risk: windows closed 97%, negative pressure room (ACH12) 39%, windows and doors fully open 33%
****N95 respirator
****ARTs for HIV patients
**<math>d</math> = duration of infectivity
***to reduce <math>d</math>
****
