Both viral and bacterial infections can result in fever, but the onset, severity, signs, and management are different.

From persistent fevers to unexplained weight loss, discover the subtle HIV symptoms doctors say you shouldn't ignore, ...

The main signs of COVID-19 are respiratory symptoms, like congestion and a cough. But COVID-19 can also cause skin rashes, ...

Pope Francis’ complex respiratory infection isn't life-threatening, but he's not out of danger, his medical team said Friday, ...

There’s no sign that Pope Francis is considering resigning one week after being admitted to hospital with pneumonia and a ...

However, despite extensive studies on IgM as an ancient antiviral weapon in warm-blooded vertebrates, its role and mechanisms in combating viral infections in early vertebrates remain poorly ...

You may not feel pain in your feet if you have diabetes, making infections easy to miss. If you have been diagnosed with diabetes, check your feet daily for signs of injury or infection. Skin contact ...

Certain opportunistic infections (OIs)—meaning infections that the body can usually control when the immune system is intact—can also start to appear. Some of the more common include viral infections ...

Americans are weathering the worst flu season in years, as a number of other respiratory illnesses circulate too, such as COVID-19, RSV and the common cold.