The reason you filtered it was to get them out of it. I would be more worried about the moisture content of the honey than the larvae. If you had left the honey in the comb unprotected for several days with out extracting it you may have had a problem but I think you will be fine. What % of the honey was capped. What do you think is the main source of the nectar? Some have higher moisture contents than others, Palm is very wet.