An “unusual” string of fatal snake bites has left three people dead in the US state of California in recent weeks, sparking concern among experts over a deadly spike in attacks. The latest victim, a 78-year-old woman, died after being struck three times while walking on a rural property in Redwood Valley earlier this month. Relatives rushed her to the hospital, but local authorities  told Sky News  that her health rapidly deteriorated and she passed away two days later. Officers said her cause of death was due to “snake envenomation from snake bites”, and a blood complication likely caused by the poison. The tragedy follows the “rare” deaths of two other hikers in the region. While around 8000 people are bitten by venomous snakes across the US every year, the country’s Centers for Disease Control and Prevention states that typically only five people die annually.…