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Nesivos Hamishpat (Choshen Mishpat) 260,6 11 (as the questioner correctly assumed) based on the Shulchan Aruch says that a minor can never give up hope and if it is known that a lost even without a siman (sign) belonged to a minor, one must return the item. ואם היו של יתומים שאינם בני מחילה אסורים - לפ"ז ה"ה באבידה בדבר שאין בו סי' כשנתוודע לו ...


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It would depend on the amount of potential the infectious disease has to kill and how clear it was the other person would get infected through his efforts. Before the infection you would be allowed to potentially kill someone on the way to potentially kill someone else with an infectious disease if there is no other way to prevent him from doing so. (Rambam ...


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