Sepsis is not contagious. You cannot catch sepsis from another person or pass it to someone else. Sepsis is your body’s own extreme reaction to an infection, not an infection itself. That said, the underlying infections that trigger sepsis (like pneumonia, a urinary tract infection, or the flu) can sometimes spread from person to person.
This distinction matters because it shapes how you protect yourself and the people around you. Understanding what sepsis actually is, who’s most vulnerable, and how to prevent the infections behind it can genuinely save lives. Sepsis accounts for roughly 1 in 5 deaths worldwide, killing about 11 million people a year.
Why Sepsis Itself Can’t Spread
Sepsis is not a germ. It’s a process that happens inside your body when your immune system overreacts to an infection and starts damaging your own tissues and organs. When you have an infection, your immune system releases signaling molecules to fight it off. Normally, that response stays proportional to the threat. In sepsis, the response spirals out of control.
Within the first hour of this overreaction, your body floods itself with inflammatory signals that trigger a chain of events: widespread tiny blood clots form in your smallest blood vessels, those vessels become leaky, and blood flow to your organs drops. Your heart races, your breathing speeds up, and your blood pressure can plummet. Organs that aren’t getting enough blood, including the kidneys, liver, and lungs, start to fail. This is all happening inside one person’s body. There’s nothing to transmit.
Think of it this way: a bee sting isn’t contagious, but a severe allergic reaction to a bee sting isn’t contagious either. The reaction is the problem, not the sting itself. Sepsis works similarly. The infection is the trigger; the body’s runaway response is the danger.
The Infections Behind Sepsis Can Be Contagious
Bacterial infections cause most cases of sepsis, though viral infections like influenza and fungal infections can also be responsible. The infections that most commonly lead to sepsis start in four places: the lungs, the urinary tract, the gastrointestinal tract, and the skin.
Some of these infections spread easily between people. Influenza travels through respiratory droplets. Certain bacterial skin infections can pass through direct contact. A stomach bug can move through contaminated food or surfaces. If one of these infections takes hold in someone vulnerable, it can progress to sepsis. So while you can’t “give” someone sepsis, you can give them the infection that eventually causes it. Between 10 and 15 percent of adult sepsis cases each year actually begin with infections acquired in a hospital, where close contact and invasive procedures increase transmission risk.
Who Is Most at Risk
Not every infection becomes sepsis. Healthy immune systems usually contain infections before they escalate. But certain groups face a much higher risk of that escalation.
- Age: Adults 65 and older and children younger than one are significantly more vulnerable. Nearly 2.9 million sepsis deaths per year occur in children under five.
- Weakened immune systems: People undergoing chemotherapy, living with HIV, or taking immunosuppressive medications have a harder time fighting infections before they spiral. About 1 in 5 sepsis hospitalizations are cancer-related.
- Chronic diseases: Diabetes, lung disease, and end-stage kidney disease (especially in people on dialysis) all raise the risk.
- Recent surgery or hospitalization: Any procedure that breaks the skin or involves catheters and tubes creates a potential entry point for infection.
- Pregnancy and postpartum recovery: Immune system changes during pregnancy, along with procedures like cesarean delivery, increase infection risk. Maternal sepsis accounts for roughly 10.7% of maternal deaths globally.
- Previous sepsis: Survivors of sepsis are at higher risk of developing it again.
Recognizing the Warning Signs
Sepsis can move fast. What looks like a routine infection in the morning can become a medical emergency by evening. Doctors screen for sepsis by checking three things that you can observe at home: a rapid breathing rate (22 breaths per minute or more), confusion or altered mental state, and low blood pressure (feeling lightheaded, dizzy, or faint).
Other signs include a high fever or abnormally low body temperature, a heart rate above 90 beats per minute, and skin that looks mottled, pale, or unusually discolored. If someone with a known infection suddenly seems confused, is breathing fast, or appears much sicker than you’d expect, that’s a red flag. Sepsis mortality in high-income countries runs between 15 and 25 percent, but when it progresses to septic shock, where blood pressure collapses despite treatment, that rate climbs to 30 to 40 percent. Speed matters.
Preventing the Infections That Cause Sepsis
Since you can’t catch sepsis but you can catch the infections that lead to it, prevention comes down to basic infection control. These steps are especially important if you or someone in your household falls into a high-risk group.
Hand washing is the single most effective measure. Wash with soap and running water for at least 15 seconds, and dry with a clean towel. When soap isn’t available, alcohol-based hand sanitizer works well as long as your hands aren’t visibly dirty. This applies after caring for a wound, before preparing food, and after using the bathroom.
Keep wounds clean and covered. Any break in the skin, from a surgical incision to a scrape, is an entry point for bacteria. Watch for signs that a wound is getting worse rather than better: increasing redness, warmth, swelling, or discharge.
Stay current on vaccinations. Influenza vaccination reduces not only flu cases but also the complications and secondary infections that can progress to sepsis. This is important for caregivers and family members too, since they can carry infections to vulnerable people at home. Pneumococcal and COVID-19 vaccines similarly reduce the risk of respiratory infections that commonly trigger sepsis.
If you’re caring for someone at home who has open wounds, a catheter, or a weakened immune system, wear disposable gloves when handling blood, wound dressings, or bodily fluids, and wash your hands after removing them. Proper disposal of used needles and sharp medical supplies also prevents blood-borne infections from spreading in a home care setting.