It is important to know that there are multiple different strains of EEHV - it is not a single disease and should not simply be referred to as ‘EEHV’. Chester Zoo animals carry EEHV1a, the most virulent and devastating strain. Whilst calves at other collections have survived, with and without treatment, almost all surviving cases have involved the less aggressive strains, such as EEHV1b. Historically, the problem at CZ (and other collections) has been an inability to determine viraemia and active infection before the animal develops clinical signs - with EEHV1a this has inevitably led to a sad outcome as the disease is too advanced to treat at that stage. In this case, it appears the disease was diagnosed before clinical signs developed and treatment was started before earlier cases. Whilst Indali is not yet ‘out of the woods’, the latest news is massive for CZ as it potentially means the first successful treatment of a calf with EEHV1a. Well done to all involved so far.