https://nypost.com/2020/03/19/sales-of-fish-tank-additive-skyrocket-after-studies-say-it-could-treat-coronavirus/ Chloroquine phosphate is used to in aquariums to kill some organisms, like algae, that may harm fish.
と、安全な薬なんだが、
Between Feb. 25 and March 2, the price paid for a single 25-gram bottle of chloroquine phosphate rose from $9.99 to over $500.
On March 18, eBay’s tracking indicated that one seller had sold 84 lots of the substance in 24 hours. By that afternoon, all sizes were sold out save for 100 gram lots, which were being listed for $519 each.