Six year old Emily Kane is sitting in front of you, looking at you with big, tearful eyes. Since you've been her family physician for several years now, you can't help but notice how different she is from her usual happy self.

Three days ago, Emily's mother called to inform you that Emily was running a slightly high temperature. You reassured her family, asking them to bring her in if her condition deteriorated.

She developed a mild rash on her chest the following day. Over time, this progressed into an itchy, blistering rash spread over the face, chest and abdomen.