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.