@reuns It was me. Comments are not for answers; comments are ephemeral. If there is content you'd like to preserve that answers a question, it should be placed in the answer box, not as a comment.

My comment to you was: "On StackExchange, comments should be for improving questions/answers. If you have an answer to what is being asked, then that should go in the answer box so people can both upvote and downvote, your answer could be potentially selected by OP as the accepted answer, etc. Comments are ephemeral and can be deleted at any time at which point they cease to be useful for visitors." I do not see the insult or harshness there

I have to say, you are not a particularly new user; you have 60k rep across the network. If you are not familiar with the purposes for comments but you can read more here: meta.stackexchange.com/a/19757/401068 and also at biology.stackexchange.com/help/privileges/comment

"When shouldn't I comment?": "Answering a question or providing an alternate solution to an existing answer; instead, post an actual answer (or edit to expand an existing one);"

"When should comments be deleted?": "any comment that violates the comment guidelines listed above or the Code of Conduct is subject to deletion."

Thank you, I am new in biology ! In maths it is very different, giving (alternative) answers in comments often happens, and they are not deleted, but when I have the answer I know I do and I post it. In biology I know I have some part of the answer, that's very different. The problem is to not engage with a new user in a friendly manner, you are engaging in a very harsh way, deleting comments I needed 30 minutes to write each time (because I am studying biology, I don't have infuse knowledge).

@reuns If you're putting that much effort into a comment it's a good hint it should go in the answer instead. Here's the text of those comments in case you'd like to make it an answer now:

"The first sequencings didn't need coronavirus speciific primers, only RNA extraction, reverse transcription, random primers, followed by illumina library preparation. But this is expensive: needs the best illumina machines and ran for a long time. Then they knew it was a (SARS-like) coronavirus so they could use the pan-coronavirus or pan-sarbecovirus primers developed for 15 years of bat screening,

During the same time they defined new primers and asked the relevant companies to synthesize it, I don't know when those were used on a large scale, in late January it was the case."

"Again during the same time they isolated the virus in vero cells (just seeding it with BALF sample from a patient) and could see it was a coronavirus in electron microscope. They could also use the pan-sarbecovirus antibody test (only at the WIV I'd say) or even a SARS-antibody test targeting N."

@reuns I'll say here too that I don't typically go through hunting for answers in comments to delete them, but I'll respond when another user raises a flag. I'm surprised by what you say about Math allowing alternative answers in comments, but yes there are some cultural differences across SE sites so that may be one. Personally I am much more permissive of "answers" in comments when they are more designed to help OP come to their own answer, though strictly this is also against the SE model