By reexamining the blood of liver - cancer patients who underwent surgery between 1992 and 1994 at Tokyo’s Toranomon Hospital, the doctors discovered that 2 of the 55 patients had been infected before surgery and that 7 others became infected after the operation.
न्यू साइंटिस्ट पत्रिका के अनुसार, हाल के सालों में रीसस जनसंख्या तेज़ी से बढ़ी है क्योंकि उन्हें खाना खिलानेवाले तीर्थयात्रियों की संख्या बढ़ी है ।