Gujarat forest officials have begun vaccinating lions in the Gir sanctuary after the sudden death of around 23 lions in the past three weeks because of the deadly Canine Distemper Virus or CDV. Around 300 vials of the vaccine have been imported by forest officials from Atlanta in the United States, according to news agency PTI. While the Gujarat forest department had earlier blamed the deaths of the lions to infighting, CDV was found to have been the cause for most of the deaths.