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Mull-a-light, get the good going. In early February, dairy cows in Texas began to look a bit sick and produce less milk.

By late March, officials had confirmed what was wrong.

The safety alert is in place after some Texas dairy cows tested positive for the bird flu.

Despite the virus ravaging the global bird population, H5M1 turning up in cows wasn't something virologists were expecting.

And as it emerged in increasing numbers of dairy herds across the US, more bad news.

A person in Texas is being treated for the highly contagious

bird flu. That's according to the Texas Department of State Health Services.

It's the first human case of the disease in the state and the second in the US.

Thankfully his case was mild, no more than about of conjunctivitis, a common symptom of

bird flu in humans. But he was lucky. Last week the World Health Organization's chief

scientist Jeremy Farrah said this animal pandemic is of enormous concern.

The virus has extraordinarily high mortality rates in humans.

So today, what's going on with bird flu in cows and are we ready if a virus like this makes the jump and start spreading

between us?

I'm the Guardian Science Editor Ian Sample and this is Science Weekly.

Ed Hutchinson, you're a biologist at the Medical Research Council University of Glasgow Centre for virus Research. Here on the

podcast we've been following the spread of bird flu over the past few years. We've

seen it moving to mammals too. There's been outbreaks in mink farms more recently it caused the deaths of

thousands of seals and their pups and it's even been detected in domestic cats

so was it much of a shock it turning up in dairy cows in the US?

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