Updated: Friday, 05 Feb 2010, 11:29 AM MST
Published : Friday, 05 Feb 2010, 11:29 AM MST
HOUSTON (CNN) - What should be a happy occasion has zoologists at the Houston Zoo concerned.
Two of the zoo's elephants are about to become the proud mothers of baby elephants.
But worries over the calves contracting the deadly herpes virus that killed another elephant over a year ago has zoo officials working overtime to keep these mamas and their babies healthy.
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