@MimiLalala,
Two things, first of all your use of the word concernedly, I have never come across concern used as an adverb, not saying it can’t be used, but I would not use it here. If you need to include something I’d say worryingly, but personally, I think it’s better without.
The phrase which carry highly contagious doesn’t mean anything.
What are they carrying that’s highly contagious? You’ve not said.
You need to say either which are highly contagious, or carry highly contagious pathogens or something similar.