Thank you for your query,
The titre is significant.
But as there is no fever it is not suggestive of typhoid fever
but this indicates previous infection with typhoid fever.
Typhoid fever will responds to antibiotic and it will subside, whereas the antibody titer will remain same for long time and on widal test
this shows positive.
And some other infections will cause the raise of typhoid antibodies
on raise and it is called anamenstic reaction and this may be the cause for positive test.
Relapse of typhoid also cause raised titre but here fever will be there.
So consult your Pediatrician
for the examination of your child and to correlate the test results.
Hope I have answered your query.