What could be the disease. Sometimes!

After vaccination on 16 april my father got fever on 24 April and in night it got worse with severe headache so on 25 April we visited a doctor and he gave some medicine and 2 injections he was having some problems in walking but after that his fever cooled down and his legs condition started deteriorating and on 28 April he lost totally his legs capability and slept all day or kind of unconscious we thought that he was kind of tired so he was asleep but in night he did not wake up so we got worried he was totally unconscious so we rush to the hospital they did the MRI and it said Multifocal T2/FLAIR hyperintensities seen in bilateral periventricular and subcortical white matter likely chronic microangiopathic changes. And they did lumber puncture test here below is the reports Now he is conscious but talks sometimes unnecessarily but now he is not able to move his legs but toe a little bit sometimes