Hepatitis B rears its tiny ugly head in the Taiwan case.

Apparently the 53M was also hepatitis B (HepB) positive as were 2/3 cases described in detail in the recent NEJM manuscript (see H7N9 page). 

Is there an association between HepB virus/viral disease and H7N9 or are these co-detections just coincidence due to high prevalence of HepB infection in China (suggested here)?