But it could turn out to be a mutation or cross strain of one or several coronaviruses seen in cows, birds and pigs.

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This means that Dr Meredith's method can reach back into the distant past, and catch a glimpse of the act of cross-fertilisation between two different varieties of grapevine that created the strain that the cuttings have perpetuated.

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Depending on the severity of your arthritis or past injury, you could consider cross training in addition to jogging to get in shape for the 10K without putting too much strain on your knee.

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