Measles is one of the most contagious viral infections: in the pre-vaccine era, its contagiousness index approached 100%. There is no specific treatment, so vaccination and timely recognition of the disease are decisive. Below is what is known about transmission, course, and protection.
How measles is transmitted
The measles virus spreads through the air: when an infected person breathes, coughs, or sneezes, along with mucus from the nose and throat. You can get infected by inhaling air that an infected person has breathed, or by touching contaminated surfaces. The virus remains active in the air and on surfaces for up to two hours. One infected person can cause up to 18 secondary cases. The source of infection is only humans; the measles virus has no animal reservoir.
Incubation and when a person is contagious
Symptoms appear 7–14 days after contact with the virus. A person is contagious from four days before the rash appears and for four days after the rash appears. Early symptoms last 4–7 days. Because of this, measles manages to spread before the disease is recognized. In the environment, the virus is not very stable — it is inactivated by sunlight, ultraviolet light, and disinfectants.
Symptoms day by day
The disease starts like a severe cold: high fever, runny nose, cough, redness, and watery eyes. At this stage, measles is easily confused with flu or another acute respiratory viral infection.
- First symptoms (7–14 days after contact): fever, runny nose, cough, redness, and watery eyes; last 4–7 days.
- After a few days: small white spots on the inner side of the cheeks and the back of the lips; last several days.
- 3–5 days after the first symptoms: rash. It starts on the face and behind the ears, and over three days spreads to the trunk, arms, and legs. Lasts 4–8 days.
- The rash usually does not itch; spots are sometimes raised and merge into irregular areas.
On white skin, the rash is red or brown; on dark skin, it is less noticeable.
Complications
Complications are the main cause of death from measles. They include pneumonia, encephalitis (brain swelling with possible damage), meningitis, seizures, blindness, severe diarrhea with dehydration, and otitis. They most often occur in children under 5 and adults over 30, as well as in children with malnutrition, vitamin A deficiency, or weakened immunity. These complications are rare, but the risk is higher in infants and people with weakened immunity. Measles itself also weakens the immune system. In pregnant women, the disease can cause miscarriage, premature birth, and low birth weight.
Who is protected
Reliable protection is provided by two doses of the vaccine. The first is usually given at 12–15 months (in countries where measles is common — from 9 months), the second at 15–18 months; often in combination with vaccines against mumps, rubella, and chickenpox. In Ukraine, measles vaccination has been used since 1968. A person who has received two doses or has had the disease has a very low risk of getting sick. In contrast, anyone without immunity can become infected.
The scale of the risk is evident from outbreaks. In 2017–2019, 115,000 people in Ukraine contracted measles, 41 died, including 26 children; in 2019, Ukrainian cases accounted for 70% of all measles cases in Europe. Worldwide, between 2000 and 2024, vaccination prevented about 59 million deaths, but in 2024 about 95,000 people died from measles — mostly unvaccinated children under 5. Global coverage with the first dose was 84% in 2025 — slightly lower than 86% in 2019.
When to see a doctor
If you suspect measles in yourself or your child, first call the doctor: measles is easily transmitted, so it is better to arrange the visit in advance. Also consult a doctor if you have been in contact with a sick person and are pregnant, have weakened immunity, or your child is under one year old.
Call 103 or 112 immediately if, during measles, a person has seizures, severe difficulty breathing (gasping, cannot say a word, in an infant — grunting or chest indrawing), cannot keep their eyes open, suddenly becomes confused, or the child becomes lethargic and does not respond as usual.
This material is for reference: it does not replace a doctor's consultation.
Sources
Update history
This content is for reference and does not replace a doctor's consultation. Medical disclaimer