If the 5' end of the inner primer is fluorescently labelled, the LAMP product should be visible as in the current study. However, visualization using inner primers fluorescently labelled at the 5' end is not preferred, because the possibility of false positives from self-extension of the labeled primer cannot be excluded. There is no risk of false positives with the oligo DNA probes fluorescently labeled at the 3' end as in this study, so that highly accurate genetic testing can be established.