Active case-finding helps to curb Zambia cholera outbreak

It is early morning in Kalikiliki, an informal settlement in Zambia’s capital, Lusaka. The active case-finding team from the nearby Kalingalinga Health Centre is en route to a household that has reported a case of cholera. The team will visit several households during the day, each member playing an essential role in ensuring that they identify other potential cholera cases and engage with community members to prevent more cases and deaths.

Active case finding is very important to the cholera outbreak response, says Chola Shimangwala, Environmental Health Officer for Lusaka District. Accounting for 86% of the total cholera cases countrywide, it is important for the district to find out what the source of the infection is, whether it is environmental or due to individual or household risk factors.

“This means we are not just shooting in the dark. Active case finding gives us a clue on which area to concentrate our efforts and resources and improve our interventions,” says Shimangwala.

Lusaka’s six sub-districts all have active case finding teams made up of around 120 people.

When the team in Kalilkliki arrives at their first stop, they find that a 12-year-old boy was discharged that morning from Levy Mwanawasa University Teaching Hospital’s cholera treatment centre. Levy, as it is known, is one of Lusaka’s biggest cholera treatment centres and treats complicated cases.

“When we reach the household with the reported case, I collect data on some of the things that they may have eaten, some of the places that they may have visited, and on the number of people that have been exposed, for us to determine who is potentially at risk,” explains Chilufya Kafula, an environmental health technologist and the team member responsible for collecting data at the household level.

“This reduces the spread of cholera among community members, especially among people who have been in close contact with the case,” adds Lweendo Namitondo, the environmental health officer who supervises the team.

If they identify anyone with symptoms, the team refers the person to the nearest health facility. “This reduces the number of people who die before they can reach a facility,” she explains.

Another key element of the team’s work is to use a chlorine spray on areas of the property that have potentially been contaminated with cholera, including the entrance and the latrine. This is the task of community-based volunteer Albert Nkhoma.

He has personal experience of the challenges faced by community members and takes his role seriously. “To lose a life is nothing good,” he says. “I volunteer because I've always wanted to see improvements for our society. I've always wanted to be part of the solution.”

While Nkhoma gets on with spraying, health promotion officer Desire Mumba assesses the level of knowledge about cholera in the household, addressing any myths or misconceptions about the disease. He educates people about the signs and symptoms and how to protect themselves from cholera by practising hand and food hygiene, drinking clean water and keeping the household clean.

“When I educate people about hygiene, I know that when I leave that house, those people will work on those things that I've taught them. That makes me happy and it's a way of giving back to the community,” says Mumba.

During the visits, environmental health technologist Eric Imbuwa tests the pH and chlorination levels of the household’s water. “We want to know whether the water that our communities are using meets the required standard for public health,” he says.

After using a special kit to conduct the tests, Imbuwa determines that it is indeed safe. This is encouraging news, indicating that the water from the local communal tap is well chlorinated and safe to drink. The team will however still stop at the communal tap for Mumba to confirm the test results, before moving onto the next household with a reported case.

Active case-finding forms part of the broader Integrated Disease Surveillance and Response platform, a comprehensive public health surveillance and response system developed by WHO and adopted by many countries in the African region, including Zambia.

“WHO plays a key role in the surveillance system in Zambia, not just for this cholera outbreak, but for all outbreaks that we experience in the country,” says Dr Muzala Kapina, director of surveillance and disease intelligence at the Zambia National Public Health Institute.