Tragic mum Tracy Swatton could have died from a fatal fit brought on by a ‘one-in-20 million’ reaction to a jab she had when she was four, her family believe.

The 37-year-old was found on the bedroom floor by her husband Tom when he came home from work.

Her sudden death has left her family distraught.

Her mum, Jean Green, of Briggate, Shipley, said her “happy go lucky daughter” had been blighted by epilepsy ever since she had a measles jab.

Despite medical research finding no statistical connections between measles jabs and epilepsy, the family are convinced her jab triggered it.

Former Telegraph & Argus columnist Dr Tom Smith said it would have been such a rare reaction that the chances of it happening would have been one in 20 million.

The fact that her symptoms began six days after the jab meant it could be a possibility, he said, even though the onset year of childhood epilepsy is four.

Typically any reaction to the measles vaccine, usually a fine rash and slight fever, happens six days to the hour of it being given.

“The chances of it triggering epilepsy are so small, that it must be about one in 20 million,” said Dr Smith.

Mrs Green said: “Tracy was perfectly healthy until five or six days after the jab when she started flickering her eyes and the fits followed. We’ve always blamed the jab for it. Even the doctors advised her not to let her sons have measles jabs.”

Doctors put her on medication after the epilepsy was diagnosed but the fits continued throughout her life – in 2005 she was hospitalised when she had 197 fits in a week.

More recently her fits had decreased to two a week, said Mrs Green.

“Only the day before she died we’d been laughing and joking together. She hadn’t been feeling too good for a few days and had been to see her doctor. When her husband Tom went to work that morning she’d taken her tablets and gone back to bed but when he came home he found her on the floor.”

Mrs Green said the family were now waiting for an inquest to determine what she died from.

“We really have no idea at the moment. We think she probably had a fit and could have fallen but we’ll have to wait and see what the tests will say at the inquest.

“We’re all in pieces, it’s hit us hard. She was a daddy’s girl and as her mum I was overprotective. She never went out much as a young girl because the fits made it difficult. The last ten years since she married Tom have been the happiest years of her life.”

Family and friends including her four brothers will say their final farewells at Nab Wood Crematorium on Wednesday at 12.40pm.