Color break may be a symptom of virus, but not always, so don't rely on that alone . It can also be a matter of issues with culture and also the compatibility of parents that were used in making the cross.
The best ways to check for virus is a in home test kit, but even those can give a false reading if not done properly. Or you can elect to sent a sample out to a professional testing faucility which is certainly more reliable.
Best to keep any plants in question isolated until you get confimation of virus and always use safe handling practices to avoid further contamination of others.
Don't forget pests can spread viruses & diseases too.
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