When colds, flu, RSV, and COVID-19 spread

Ever been sitting next to someone coughing and sneezing who assures you, “Don’t worry, I’m not contagious”?

In this episode of Healthy Looks Great on You, Dr. Vickie takes listeners to mini medical school to answer a question many people misunderstand: how do you actually know if you’re contagious?

Upper respiratory infections like the common cold, influenza, RSV, and COVID-19 are among the most contagious illnesses we encounter. They spread easily through coughing, sneezing, and even contaminated surfaces. And one of the biggest challenges is that people often spread these viruses before they realize they’re sick.

Understanding when you are contagious can help protect the people around you—especially babies, older adults, and anyone with a weakened immune system.

Fever isn’t the only sign that you’re spreading germs.

In This Episode You’ll Learn

• When colds, flu, RSV, and COVID are most contagious

• Why you can still spread illness without a fever

• How to tell the difference between allergies and a viral infection

• Why antibiotics don’t work for colds and most bronchitis

• What makes RSV particularly dangerous for infants and older adult

When Are You Contagious?

Many people assume they’re only contagious if they have a fever. In reality, most respiratory viruses spread through coughing, sneezing, and respiratory droplets, even when fever isn’t present.

Symptoms that suggest you may be contagious include:

• coughing

• sneezing

• runny or congested nose

• sore throat

• fatigue or body aches

In fact, many viral infections become contagious one to two days before symptoms begin, which is why illnesses spread so quickly through households, workplaces, and schools.

Why Antibiotics Usually Aren’t the Answer

Most upper respiratory infections are caused by viruses, not bacteria. That means antibiotics won’t treat the illness and can actually cause harm when used unnecessarily.

Taking antibiotics when they aren’t needed can disrupt the gut microbiome and contribute to antibiotic resistance, making infections harder to treat in the future.

Understanding when you may be contagious is one of the simplest ways to keep your family and community healthier.