All right, so let's talk about some high-yield pediatric viral illnesses. There is a number of them,

Roseola, measles, mumps, among many, many others. Quick thank you to all of the support for the channel, buying a T-shirt, just a nice comment in general. It really makes my day. So thank you so much. Let's go ahead and get started with Roseola. So Rosiola, also known as Exanthum, Subitum, Only a few things to know. The peak prevalence is going to be between seven and 13 months and 90% of cases are going to occur in children younger than two years of age. Human herpes virus 6B is the most common cause of roseola, and therefore it's the one you need to know. It's usually spread for asymptomatic shedding of the virus and secretions to close contacts. Clinical presentation, this is the highest yield thing you need to know. It's a fever, then a rash on the trunk in that order. So we start with a fever. Fever is usually going to last around three days. It can be over 104 degrees Fahrenheit in some cases, most of the time besides some fussiness, child will otherwise be fine, alert, active, etc. Then after three to five days we have our rash. And if there is one thing I want you to remember, more than anything else for Rosiola, please remember the rash starts on the trunk. Really important as these findings are what will help you differentiate from other viral exanthums. So after the fever, a blanching macular or maculapular rash will popular rash will popular rash up starting, starting on the trunk, then later spreading to the face and extremities.

That is the key fever, then rash on the trunk that later spreads elsewhere.

The rash that starts in the trunk is very specific to Roseola and will help you get the answer right.

Please remember it.

All right, so for diagnosis, this is going to be a clinical diagnosis based on the presentation we just mentioned, meaning nothing really to know here. And then for treatment, as this is typically a self-limited disease, treatment is supportive, Cedomenophon for fever, etc. So nothing really to know for diagnosis or treatment, meaning your juicy details are in the clinical manifestations as well as the causative agent. I do not want you to forget that the rash starts on the trunk. I keep saying that because it's very important. And I also think it's a good idea to remember this is most commonly caused by HV6. So when you see Rosieola, Rosie Ola, I want you to think of a lady named Rosie waving Ola. Rosie is waving Ola or hello with her hand. Oddly, her hand has six fingers,

which helps you remember HHV6 because her hand have six fingers. That's all the letters in there, HHV6, which is the most common cause. Then Rosie has a big tattoo on our chest of a rose, of course, which helps you remember that this is one of the only viral exanthums where the rash starts on the trunk. And if this is mentioned in a vignette, almost certainly they'll be talking about Rosieola.

So again, remember Rosie Ola.

Rosie is waving Ola, six fingers are in her hand to help you remember this is caused by H.HV6.

And she has a tattoo of a rose on her chis to help you remember this is where the rash originates.

Next, let's talk about varicella zoster virus infection, aka chicken pox.

Veracella zoster virus causes two diseases, the primary infection, which is chicken pox,

and then later reactivation of the latent virus known as herpesoster or shingles.

So when we're talking about the primary varicella infection, aka chicken pox, this is a highly

contagious disease, which is spread via aerosolized droplets or by direct contact with fluid from skin lesions.

The clinical manifestations, initially fever, malaise, pharyngitis, blah, blah, blah.

Here's the high-yield part.

These nonspecific symptoms are followed by the development of a generalized vesicular rash, usually within 24 hours.

So this is what you need to know.

And the phrase that I used to remember was varying vesicles. What does this mean? So in varicelizoster, you're going to have these fascicular lesions, so these little fluid-filled blisters, and they're sitting on top of an erythematos base.

So red skin, sometimes, this is called dew drops on a rose petal, where the vesicles are the dew drops and the red

skin is the rose pedal anyways back to the important part why should you remember varying vesicles

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