22OCT

Six Saudi MERS cases had no camel link

2 min read

16:36UTC

Saudi Arabia reported eight MERS cases and one death this year to 5 October, WHO said. Only two patients reported touching camels, the usual source, and WHO found no links between any of them.

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ScienceAssessed

Key takeaway

Six of Saudi Arabia's eight MERS patients this year had no known exposure to camels.

Saudi Arabia reported eight cases of MERS (Middle East respiratory syndrome, a coronavirus usually caught from camels) and one death between 1 January and 5 October, WHO said on 15 October⁠¹. Only two patients reported direct camel contact. Six had no known exposure, and WHO found no links between any of the cases, which came from six places including Riyadh, Taif and Tabuk.

No health workers were infected and no case led to another, which argues against hospital chains; for six patients the route of infection is unknown. Five were over 70 and seven had other illnesses. Camels remain the known reservoir: in August WHO, the Food and Agriculture Organization and the World Organisation for Animal Health reported MERS fragments in camels in the Nile Basin.

WHO says the explanations offered for the fall in MERS since 2020, among them weaker surveillance and a milder virus, "are not supported by current evidence"⁠². The Kingdom now tests for MERS inside routine respiratory surveillance, which should catch more mild cases.

Deep Analysis

In plain English

MERS is a respiratory illness caused by a coronavirus, a relative of the virus that causes COVID-19. It was first found in Saudi Arabia in 2012 and causes fever, cough and pneumonia. Most human cases come from contact with dromedary camels, which carry the virus. It can spread between people in close contact, especially in hospitals, but this is rare. WHO tracks every case because the virus kills a large share of those infected and could become more dangerous if it learned to spread easily between people.

Deep Analysis

Root Causes

Dromedary camels carry MERS across the Arabian Peninsula and much of Africa, and most adult camels show signs of past infection. People catch it through close contact with camels, and possibly through raw milk or meat, routes that patients may not report as camel contact.

Older people and those with other illnesses are more likely to fall seriously ill and be tested. Five of this year's eight were over 70, so the case count reflects severe disease and misses milder infections.

Routine respiratory surveillance, which now includes MERS testing, should find more of those milder cases and give a truer picture of how often the virus reaches people.

What could happen next?

Risk
Six cases without known camel contact leave open whether undetected exposure routes exist.
Consequence
Routine respiratory testing for MERS in Saudi Arabia should raise reported mild cases in future counts.

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: In 2013 MERS cases in Saudi Arabia also lacked an obvious source, until researchers at Erasmus MC in Rotterdam and Qatari authorities found antibodies and then the virus itself in dromedary camels. The source was found by testing animals, not by questioning patients.

Counter-parallel: In 2015 one traveller returning from the Middle East seeded a hospital outbreak in South Korea that spread between wards and hospitals before anyone tested him. This year's Saudi cases show the opposite: no health workers infected and no case leading to another.

Saudi Arabia hosts huge numbers of pilgrims each year for the Hajj and Umrah, and any sign of human-to-human MERS spread would bring pressure for screening and travel advice. This year's pattern, with no linked cases, gives no grounds for that.

Camel farming and racing are significant industries in the Gulf. Control measures aimed at camels, such as restrictions on markets or raw milk sales, carry real costs for herders.

Consensus view: WHO rejects the common explanations for the fall in MERS since 2020, among them weaker surveillance and a milder virus, as unsupported by current evidence, which leaves the decline itself unexplained.

Counter-view: Research led by the University of Hong Kong found that MERS viruses circulating in African camels replicate less well in human cells than the Arabian strains, though the virus is common in camels on both sides of the Red Sea. On that reading the human risk depends on which viral lineage sits in local herds, as well as on how much contact people have with camels.

Key tension: What infected six patients with no known exposure: indirect contact with camels or camel products that nobody recorded, or human chains that testing did not catch.

Sources:World Health Organization

Mentions:Tabuk →Saudi Arabia →MERS-CoV →World Health Organization →Riyadh →Taif →Rotterdam →Middle East respiratory syndrome →South Korea →Middle East →World Organisation for Animal Health →Red Sea →Nile Basin →Hong Kong →

First Reported In

Update #15 · Ebola travels to Kenya and Nigeria

World Health Organization· 22 Oct 2026

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Written with AI from Lowdown's published reporting. Not individually reviewed by an editor. Editorial standards.