The common cold was an illness caused by a virus. It was frequently contracted by humans. Time Lords were also susceptible to it.
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The First Doctor was suffering from a cold when he, Ian Chesterton, Barbara Wright and Vicki Pallister visited Sonning Palace in England in 1400. (AUDIO: The Doctor's Tale)
The Sixth Doctor caught a cold shortly after taking on Evelyn Smythe as his companion. (AUDIO: The Spectre of Lanyon Moor)
Leonardo da Vinci had a cold when he drew a sketch of which Grace Holloway had a print in her home. (TV: Doctor Who)
Henry van Statten found the cure for the common cold in a crater. However, he chose not to market it as he could make more money from repeatedly selling duds. (TV: Dalek)
By the late 22nd century, cold vaccines were available. (PROSE: Fear Itself)
During the 57th Segment of Time, 20th century native Dodo Chaplet nearly wiped out the inhabitants of the Ark when she passed it on to them, as they had no immunity to the infection, all human knowledge of the common cold having been lost in the Primal Wars during the Tenth Segment of Time. A Monoid died from the virus. The First Doctor was able to develop a cure and save the ill. He used Steven Taylor as a guinea pig for his tests on the orders of the Ark's commander. However, the Doctor cured but one strain. After he and his companions left, the cold severely weakened the human population of the Ark. (TV: The Ark)