It means you insert a comma and an ampersand before the final author.

http://people.instructure.com/eportfolios/110062/GP_Oral_Tren_250_Mcg_Xenon__Dragon_Pharma__Oral_Steroids
http://sdhc.instructure.com/eportfolios/15153/Syringe_Used_For_Covid_19_Vaccine__Becton_Dickinson__Syringes

縺ゅ縺 メッセージ
Reddit personality and YouTuber is still up on his investment, but much less than a week ago when he shot to fame.