Probably a virus that causes variable discolouration commonly on camellia spp. - small yellow marks here and there on leaves, groups of yellow marks or yellow leaf margins. It is uncommon for more than a few leaves to show this abnormality. The plant grows and flowers normally. Remove leaves showing symptoms if they are bothering, but symptoms will develop on other leaves from time to time.
Fairly common disorder of Camellia's with a large proportion of them having this. Normally not an issue as it is masked by the chlorophyl in the leaf. Spread by infected propagation material and in some cases virus's like this one are encouraged giving the variegation found in some cultivar flowers and leaves.
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