Thermally damaged?

What's with this?

Wellington Regional Hospital has issued an alert that up to 16,000 patients may have received faulty tetanus shots.

Capital and Coast District Health Board said there had been a possible fault with a refrigerator in the emergency department at Wellington Regional Hospital.

CCDHB spokesman Andrew Simpson said some patients who visited the ED have received a tetanus injection that "may not have been effective as it was thermally damaged."

So far so good that bit I understand. Here's where it goes a bit off the rails

The hospital said it could not guarantee that the refrigerator had always been within the right temperature range and therefore up to 16,000 tetanus boosters may have been affected in the past 10 years.

Now the usual incubation period for tetanus is eight days although it can be longer a few months maybe at most. And indeed the story tells us there have been exactly two cases of Tetanus in the Wellington region during the decade of the possibly faulty refrigerator, the possibly thermally damaged vaccine being implicated in neither.

So why is this a story? A press release to announce A&E at Wellington hospital has a new fridge perhaps?