When 11-month-old Alba Moss developed a high fever in early 2019, her parents initially thought it was a routine childhood illness. Within days, the fever soared above 107°F (nearly 42°C). Her body became swollen and weak, her eyes closed completely for four days, and she struggled to breathe. At one point she was almost completely unresponsive.

Alba, who lived with her parents Jilly and Richard Moss in the London area, was too young to have received her first dose of the MMR (measles, mumps and rubella) vaccine. Like all infants under 12 months, she had no vaccine-derived protection against the highly contagious virus.

Doctors initially misdiagnosed the illness. After an ambulance trip to hospital with a soaring temperature, she was treated for viral tonsillitis and sent home. The condition worsened. A rash appeared, her eyes became red and swollen, and she deteriorated rapidly. Only after she was admitted to Chelsea and Westminster Hospital was measles confirmed.

In hospital Alba required oxygen support, intravenous fluids, tube feeding, vitamin A to reduce the risk of blindness (a known complication of measles), antibiotics for secondary infections, and close monitoring. Her body was so swollen and dehydrated that staff struggled to take blood samples. She spent eight days in hospital fighting the infection.

“It has been absolutely horrific watching our daughter fight this with her eyes swollen shut for four days,” her mother Jilly Moss later wrote. “She has been in the dark, scared with a high fever that lasted for over two weeks.” At one stage the family feared they might lose her.

Measles is far more than a rash. The virus can cause pneumonia, encephalitis (brain inflammation), permanent vision or hearing loss, and in rare cases death. Infants and young children are especially vulnerable. Alba recovered, but the experience left a lasting impact on her family.

Jilly Moss shared photos of her daughter’s ordeal on social media to show other parents the reality of measles in an unvaccinated infant. She stressed that Alba’s illness could have been prevented if community vaccination rates had been high enough to protect those too young to be immunised themselves — a concept known as herd immunity.

Alba’s case became one of several high-profile stories during a period of rising measles cases in the UK and elsewhere, driven in part by declining vaccination uptake. Health authorities continue to urge parents to ensure children receive the two recommended doses of MMR vaccine on schedule.

For the Moss family, the message is personal and clear: measles is not a mild illness, and babies too young for the vaccine depend on the protection of those around them.

Sources

• CNN, BBC News, and The Times reports on Alba Moss (April–May 2019)
• Interviews and social media posts by Jilly Moss
• Chelsea and Westminster Hospital case details reported in UK media