Yuval Cohen, a 23-year-old from Israel, is in critical condition in a hospital in Thailand after recently embarking on a long-awaited trip. His sister, Racheli, has made a public appeal for donors with the O negative blood type to come forward and help save his life. She explained that Yuval can only receive this specific blood type and urged anyone able to donate to visit Nakornping Hospital. The family is hoping for a swift response from the community to support Yuval during this urgent time.