It was not the first time he had seen such symptoms.

We are not at the flash point yet, but you see symptoms.

"Another week or so before we see frank symptoms, I expect."

He had seen similar symptoms before on road accident victims.

As the root begins to die, you begin to see secondary symptoms above ground.

Neither of them had seen such symptoms in almost two decades, but the signs were unmistakable.

"These investigators have reproduced symptoms seen in not just one member of the disease family, but many," he said.

They are on the lookout for problems and their training has prepared them to see symptoms.

Researchers have sought to develop models to understand the variety of symptoms seen in humans.

Click to see the signs and symptoms that are used to diagnose the condition.