Global cholera outbreaks deeply linked to climate change: WHO official

Cholera outbreaks worldwide are deeply linked to climate change, a World Health Organization (WHO) official said on Tuesday after a meeting of a key advisory group on immunisation.

Dr Kate O’brien, the WHO’S director of immunisation, vaccines and biologicals, spoke at a press conference of the organisation’s Strategic Advisory Group of Experts on Immunisation, known as SAGE.

“I think we do have to acknowledge the cholera outbreaks that are ongoing are deeply linked to climate change in emergency situations, conflict situations, and we have raised the alarm on cholera,” said O’brien.

“It’s not only about vaccines; certainly it’s not the first line of defence for cholera. Cholera is a disease around clean water and clean sanitation. And vaccines are a method to prevent disease when it’s around.”

O’brien also said the world was currently gearing up for measles outbreaks.

“With outbreaks going on, climate change, populations on the move and humanitarian crises, the prevention of disease through immunisation couldn’t be more important than it is now,” she said.

She said immunisation programmes have shown that resilience to diseases is at the heart of responding to new pathogens, ‘in particular pathogens like we’ve all just experienced, the COVID disease’.

She said the SAGE group had recently previewed new tuberculosis vaccines and several TB vaccines are in the pipeline to prevent adolescent and adult disease.

“TB is one of the most impactful diseases that takes the lives of people around the world. Over 1.3mn people died of tuberculosis in 2022, with over 10mn falling ill from tuberculosis,” O’brien said

She also said the biggest impediment to access to vaccines is not disinformation, which was prevalent at the height of COVID, but the availability of such medicines in some areas.

“I think we saw in a very poignant way in the COVID pandemic that the availability of vaccines and access to vaccines alone is not sufficient. There really does need to be community demand, family demand and individual demand for the vaccines so that people go and get what is available to them.

“And over the past, as you well know, during the COVID pandemic, there was a really impressive scaling of the amount of misinformation and frankly just overwhelming amounts of information, which we refer to as an ‘infodemic’,” she added.

She said some of that information was incorrect, either unintentionally incorrect or intentionally, or misinformation.