Hey, Annie. It is so awesome to have a medical professional like yourself at our service, especially at a time like this. One thing I don't understand is this viral load exposure. With other common coronaviruses, flus, etc.., I've always understood that once they are in you, no matter how much or how little, the invaders multiply exponentially in your body. Why is this SARS effectiveness dependent on the initial amount? For two weeks before I got my first symptoms, I saw no one and only went to the grocery store twice. I took all the recommended precautions, so I had to be exposed to a very small amount. That amount incubated and multiplied within me until my symptoms started, and then became much worse. Could you give me the simple explanation of role of viral load with this thing?