No you can't discuss any information that has a high likelihood of identifying an individual patient. That means you can't mention age above (85 YO) lets say since so few people are that age it becomes an identifying characteristic. In this case the relatively few number of cases. The relatively few number of people that were in Ebola parts of Africa and then flown here, the fact that they were sent to various parts of the country. It wouldn't take a super sleuth to put names on these people.
That said HIPPA is a horrible law and should be repealed. It is only there to protect politicians, celebrities and PC groups dependent on health care. From a public health standpoint it's a nightmare.
HIPAA got its start as part of HillaryCare, the only part she got through as First Witch. Its been made even worse since then.