Method: We selected the most frequent natural mutations within
ORF-I sequences (
F3L,
S23P,
D26N,
G29S,
P34L,
C39R,
L40F,
P45L,
F61L,
S63P,
L66P,
S69G,
R83C,
R88K and
P91S) to evaluate their possible association with the development of
HAM/TSP using the Excel program.