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Health54 outlets ran this3 min read

Italy reports over 650 West Nile virus cases amid warming climate

Rising temperatures and longer warm seasons are linked to increased mosquito activity and virus transmission across Europe.

AI-assisted coverage comparison, editor-supervised · How this was made

Published Updated
Italy reports over 650 West Nile virus cases amid warming climate

What this story says

  • Italy has recorded more than 650 West Nile virus infections this year, making up approximately half of all cases in Europe.
  • Health officials and researchers link the increase in infections to rising global temperatures and longer warm seasons, which promote mosquito reproduction and extend the virus's transmission period.
  • The Netherlands has also reported over two dozen cases and several deaths, marking its first West Nile virus activity since 2020.
  • Experts cite a warming climate, loss of biodiversity, and changes in land use as factors contributing to the heightened activity of West Nile virus.

Who covered it

Left 36%(16)Centre 43%(19)Right 21%(9)

Percentages are shares of the 44 outlets carrying a published leaning rating. 10 of the 54 outlets we know ran this story carry no rating and are not counted in them. Coverage measured .

Trust

60/100

Craft

65/100

Hype

20/100

54 sources · methodology

Missing from the right

Only 9 of the 44 outlets with a published leaning rating that ran this story are rated right.

A reader who follows the right would not have seen this. We report the absence rather than explain it: outlets choose what to cover for many reasons, and we have no evidence about which one applies here.

Italian health authorities have documented over 650 West Nile virus infections this year, accounting for roughly half of all cases reported across Europe. This surge is occurring as warmer temperatures and extended warm seasons are observed across the continent. Antonino Bella, a researcher at Italy's National Institute of Health, stated that higher temperatures linked to climate change facilitate mosquito reproduction and prolong the transmission season, thereby increasing the likelihood of infected mosquitoes spreading the virus to humans.

West Nile virus has been considered endemic in Italy since 2020, with cases typically appearing each summer and early autumn. While most infected individuals experience no symptoms or mild flu-like illness, a small percentage develop severe neurological complications, primarily older adults and those with pre-existing health conditions. This year's case numbers are consistent with recent seasons, but warmer weather can extend the transmission period into November. Additionally, areas previously unaffected by the virus are now reporting infections, indicating a gradual spread.

The Netherlands has reported more than two dozen West Nile cases this year, along with several deaths, representing the first such occurrences since 2020. Marc-Alain Widdowson of the WHO Europe office noted that warming weather expands the replication period for both the virus and its mosquito vectors, allowing them to survive longer. He cautioned against attributing the phenomenon solely to climate change but acknowledged that a warmer climate leads to a longer mosquito season and better virus survival.

Experts also point to a warming climate, loss of biodiversity, and alterations in land use as contributing factors to the increased West Nile virus activity. A longer mosquito season provides more opportunities for transmission, and a decline in bird diversity may favour species that are efficient reservoirs for the virus. The European Centre for Disease Prevention and Control (ECDC) has warned that Europe's warming trend, characterised by more frequent and severe heatwaves and floods, creates more favourable conditions for invasive mosquito species like Aedes albopictus and Aedes aegypti.

Disagreement on virus spread

While Italian health authorities report over 650 West Nile virus infections this year, accounting for about half of Europe's cases, the digest from Unknown outlet, under the headline "With the Heat Rising, a Virus Hits Italy!", offers a more general statement that "a virus hits Italy" without specifying case numbers or the proportion of European totals.

What the coverage left out

None of the left-rated digests mention the specific detail that Italy's West Nile virus cases have been considered endemic since 2020, when cases began to surge. None of the centre-rated digests mention the specific detail that Italy's West Nile virus cases have been considered endemic since 2020, when cases began to surge. None of the right-rated digests mention the specific detail that Italy's West Nile virus cases have been considered endemic since 2020, when cases began to surge.

Tags:#WestNileVirus#ClimateChange#PublicHealth#MosquitoBorneIllness#EuropeHealth

Coverage settled. We checked this 12 times and stopped on 24 Sept 2026, 14:15. The figures above are what it finished at.

How each side covered it

Our own reading of the reporting listed below, written from the outlets’ articles rather than quoted from them. The reasoning is set out on our methodology page.

Left

16 rated outlets

  • Left-rated reports led with the connection between rising temperatures and the spread of West Nile virus, highlighting Italy's significant case numbers. They cited Antonino Bella, a researcher at Italy's National Institute of Health, who explained that higher temperatures linked to climate change help mosquitoes reproduce and extend the transmission season. These reports also included information from Marc-Alain Widdowson of the WHO Europe office, who discussed how warming weather expands the virus and vector replication period. The spread of invasive mosquito species like Aedes albopictus and Aedes aegypti, and their potential to transmit various diseases, was also noted, referencing warnings from the ECDC about Europe's warming trend and increased frequency of heat waves and floods.

Centre

19 rated outlets

  • All centre‑rated outlets reported that rising temperatures and longer warm seasons are enabling mosquitoes to spread West Nile virus across a wider area and for more months. Digests from WBAL, WKMG, WPLG, Winnipeg Free Press, Washington Top News, Medical Xpress, KOB 4, Cecil Daily, Daily Journal and Ilta‑Sanomat also noted that more than 650 infections have been recorded in Italy this year, roughly half of Europe’s total.
  • The full reports by My Mother Lode and KPBS added expert commentary. They quoted Antonino Bella of Italy’s National Institute of Health explaining how heat extends the transmission season, and WHO Europe official Marc‑Alain Widdowson describing climate‑driven longer mosquito activity, biodiversity loss and land‑use change as contributing factors.
  • Digests omitted the broader European context found in the full reports. They did not mention the Belgian research team’s visit to the ISS, the Netherlands case numbers, the European Centre for Disease Prevention and Control warning, or the description of Italy’s extensive monitoring network. No centre outlet included any cost estimate or policy response.

Right

9 rated outlets

  • Right-rated reports highlighted that Italian health authorities are observing evidence of rising temperatures and longer warm seasons contributing to the spread of West Nile virus across a wider area and for more months of the year. They mentioned that Italy has reported over 650 infections so far this year, representing about half of Europe's cases. These reports also noted that warmer temperatures favour mosquito reproduction and can extend the transmission season, potentially lasting until November.

Questions about this coverage

How did the left and right cover Italy reports over 650 West Nile virus cases amid warming climate?
Of the 44 outlets on this story carrying a published leaning rating, 36% are rated left, 43% are rated centre, 21% are rated right. Those percentages are shares of the rated outlets, not of every outlet that ran it, which was 54. The sections above set out what each side emphasised, in its own terms.
Is Italy reports over 650 West Nile virus cases amid warming climate left or right?
Neither side dominates it. Of the 44 rated outlets on this story, 36% are rated left, 43% are rated centre, 21% are rated right, and no side holds the 70% this site would want before calling a field one-sided. A story is not left or right in any case; the outlets that carried it are what carry ratings.
Is the coverage of Italy reports over 650 West Nile virus cases amid warming climate biased?
Italy reports over 650 West Nile virus cases amid warming climate is one event reported by 54 outlets, and this page does not rate the story as biased or unbiased. What it publishes is the spread: which outlets ran it, where named rating organisations place each of them on the spectrum, and what each side chose to lead with. A leaning rating describes an outlet's record over time, not this article, and the two should not be run together.
Which side is not reporting Italy reports over 650 West Nile virus cases amid warming climate?
When we first saw this story, outlets rated right had barely covered it. Coverage accretes for hours after an event, so that is where to look rather than a verdict — the split above is the current count, and it is the one to read.
Which outlets covered Italy reports over 650 West Nile virus cases amid warming climate?
54 that we know of, every one of them listed further up this page with a link to its own report and to what we hold on the publisher. Nothing here is a summary of somebody else's summary: the outlets are named so the original reporting can be read.
How many West Nile virus cases has Italy reported this year?
Italian health authorities have reported over 650 West Nile virus infections this year. This figure represents approximately half of all cases recorded across Europe, indicating a significant concentration of the virus within Italy.
What is causing the increase in West Nile virus cases?
Experts and health officials link the rise in West Nile virus cases to a warming climate. Rising temperatures and longer warm seasons promote mosquito reproduction and extend the period during which the virus can be transmitted to humans.
Has West Nile virus spread to other European countries?
Yes, the Netherlands has reported over two dozen West Nile virus cases and several deaths this year, marking its first occurrence since 2020. Experts also note that warming weather is expanding the virus and vector replication period in more countries across Europe.

Read it at the source

54 outlets, grouped by the leaning a published rating gives them. Every headline links to the original; an underlined outlet name opens our profile of that publisher.

Left

16
Show 8 more

Centre

19
Show 11 more

Right

9
Show 1 more

Not rated

10
Show 2 more

How did this read?

About the coverage, not about the story. We do not ask whether you agree with what happened — we have no honest use for that answer.

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