In late January 2020 during the 2019–20 coronavirus outbreak, Chinese medical researchers stated that exploratory research into chloroquine and two other medications, remdesivir and lopinavir/ritonavir, seemed to have "fairly good inhibitory effects" on the SARS-CoV-2 virus, which is the virus that causes COVID-19. Requests to start clinical testing were submitted.[43] Chloroquine had been also proposed as a treatment for SARS, with in vitro tests inhibiting the SARS-CoV virus.[44][45] However, at least one case of self-medication with chloroquine for COVID-19 has caused a fatality, and the Nigeria Centre for Disease Control has stated that such self-medication "will cause harm and can lead to death."[46]