Identifying bugs isn't real easy to do. As I recall, it takes about a month to even culture tuberculosis. Then you'd have to stain it, maybe use some molecular markers or other quick method of checking the surface of the bacteria.If I had to hazard a guess, I'd assume his local County Health Agency did some sort of screening of his TB initially, hence the presumptive diagnosis of a multi-drug resistant strain.

From there, the CDC probably got involved and did a full blown ID of the strain of TB. DNA analysis and such, which again, can't be done in an hour.