Nigeria’s recent Ebola case has raised an important question: why must the country obey the 42-day rule before health authorities can declare the outbreak over?

The answer lies in how Ebola spreads and how long it can take for symptoms to appear. The 42-day rule gives public health officials time to check for possible new infections and confirm that transmission has stopped.

What Happened in Nigeria?

On 20 October 2026, Nigeria confirmed an imported case of Bundibugyo virus disease, a type of Ebola disease, in the Federal Capital Territory. The patient had travelled from Uganda and was isolated for treatment. By 26 October, she had been medically evacuated to Switzerland for further care. Health authorities continued monitoring people who might have been exposed.

The case prompted a public health response involving contact tracing, medical monitoring and infection prevention measures.

Why Is the Waiting Period 42 Days?

Ebola symptoms can appear between two and 21 days after exposure. Someone who has been infected may therefore develop symptoms days after their contact with the virus.

The 42-day rule is twice the maximum incubation period of 21 days. It provides an additional safeguard, helping health authorities check that no further cases have emerged from the known chain of transmission.

The countdown generally begins after the last confirmed patient has tested negative twice, in line with WHO guidance. If another case is confirmed, officials must reassess the situation and the countdown.

What Symptoms Should You Watch For?

Ebola can cause fever, headache, unusual tiredness, muscle pain, vomiting and diarrhoea. Some people may also experience abdominal pain or unexplained bleeding.

These symptoms can occur with other illnesses, so having them does not automatically mean someone has Ebola. However, anyone who believes they have been exposed and develops symptoms should contact public health authorities immediately and follow their instructions.

How Can You Help Prevent the Spread?

Ebola spreads through direct contact with the blood or body fluids of an infected person, including someone who has died from the disease. It can also spread through objects contaminated with infected body fluids.

Wash your hands regularly with soap and running water. Avoid contact with potentially infected body fluids and do not spread unverified reports about suspected cases.

The 42-day rule is not a reason to panic. It is part of a careful process that helps health officials determine when an outbreak has ended. The 42-day rule also shows why contact tracing, early detection and public cooperation matter during an outbreak.

For reliable updates, follow the Nigeria Centre for Disease Control and Prevention (NCDC) and the World Health Organization (WHO). To read our last blog on why your bones are important, click on this link: https://fdahospital.org/your-bones-are-living-tissue-heres-why-that-matters/