Q$2\mathrm{.}9.$ All else being the same, which of the following changes will slow down the spread of the flu? $($That is$,$ which change flattens the shape of the orange lineinfecteds vs$.$ time?$)$

Check all that apply:

A lower population density

A lower transmission rate

A longer infectious period $($i$.$e$.,$ slower recovery$)$

$$

$9/18$

esc

F$1$