However, not all of them were necessarily in close physical contact with the Liberian national, Dallas County’s Health and Human Services director Zachary Thompson said. That number is in addition to the 12 to 18 people who had direct contact with Duncan, including some school-age children, Texas Gov. Rick Perry said Wednesday.

It’s unclear if Duncan was already showing symptoms of the virus when he or his family in North Dallas came into contact with the estimated 80 people. But those contacts will be investigated, questioned and monitored to determine exactly how close they got…

Separately, Texas health officials have ordered four family members who had contact with the Dallas Ebola patient to stay home and not have visitors to prevent the potential spread of disease.