High prevalence of Felis catus gammaherpesvirus 1 infection in haemoplasma-infected cats supports co-transmission.

•A 19-fold increased risk of FcaGHV1 detection identified in haemoplasma-infected cats.•Co-transmission of haemoplasmas and FcaGHV1 during territorial encounters is supported.•FcaGHV1 prevalence of 11% of UK cats confirms globally endemic infection.•Further investigation into the role of FcaGHV1 in feline diseases is warranted.