proof ur frenz kena radiation
no proof dont simply post here 

pls understand wat is radiation first
if u frenz really kena radiation and sick,
he must hv consume the radiation product directly
or he stay next to fukushima

fyi normal radiation exposure, he will need at least 5-10years to see the effect
tat mean at da time, he is cancer patient

from my point of view, ur frenz most likely not used to winter weather
and mayb he/she infected with japanese flu variant which our body immune system dont hv the antibody to fight back

my 2cents