If your wbc count goes from 10-11 in a day does that mean a real bad infection?

See below: That level of WBC does not indicate by itself a severe infection. This is just abopve normal.

Unlikely...: First, WBC counts of 10k vs. 11k are essentially the same. Such a modest difference is unlikely to be clinically significant. However, more important could be the change in the differential. For example, a significant rise in neutrophil percentage accompanied by a fall in lymphocytes could give nearly the same total WBC count yet indicate profoundly different clinical scenarios. Need more info.