Here is reported an outbreak in January 2016 of California flu which cannot be treated antibiotics.
Flu is a virus and antibiotics are for bacteria. Since it was in January, deficiencies in Vitamin D could have been a factor, and a preventive once late spring arrived. I would have recommended high Vitamin C fed intravenously, anywhere from 25 mg per 24 hours up to 200 mg. per 24/hr. See Dr. Robert Cathcart for more info.
As a virus, zinc with an ionophore like HCQ or Ivermectin might have been effective. Let us hope nothing like this gets loose in Ukraine now.
Check the date of publication and posts #5, 6, and 9. The story is anti-Ukrainian propaganda put out by the DNR in 2016.