The results of a bacterial blood infection of a lab rat are shown in the graph, where the vertical axis represents the number of bacteria per milliliter of blood and the horizontal axis represents...

Extracted text: The results of a bacterial blood infection of a lab rat are shown in the graph, where the vertical axis represents the number of bacteria per milliliter of blood and the horizontal axis represents time in hours since the rat was infected. If the rat is only considered "sick" with an infection rate of at least 30 bacteria per milliliter, for how long was this rat actually sick? 80- 60 40- 20 10 15 20 O a 14 hours O b 6 hours 18 hours 22 hours