Rabbit Hemorrhagic Disease Virus (RHDV) is a calicivirus that affects rabbits. This includes wild and domesticated European rabbits (Oryctolagus cuniculus), from which our own domesticated rabbits are descended. Outbreaks in the southwest U.S and in New York are occurring in 2020 < link >
Any sudden rabbit death is suspicious and should be reported to your veterinarian as a possible case of RHDV.
Source: House Rabbit Society, August 14, 2020. Link. RHDv2 is a small non-enveloped virus, which are fairly resistant to disinfectants. It is often a very swift and sudden killer, giving little warning. Rabbits may die without showing any symptoms at all. Rabbit owners need to take precautions to avoid rabbit to rabbit contact and ensure they don’t become a fomite themselves.
Also see: 
Rescue™ and RHDv – What you need to know, Virox Animal Health, August 6, 2020. Link. Due to the significance of this issue the EPA enacted its Emerging Viral Pathogens policy against this virus. It states that disinfectants with claims against two small non-enveloped viruses, each from a different family, can be expected to kill RHDv2 as well.
Rescue™ is effective against viruses, is non-toxic and non-irritating to people and animals when used as directed. It provides you with confidence that the health of your rabbits are protected, without compromising the safety of your team or any other animals in your care.