Hi, I understand your concern for your daughter. Lysol (benzalkonium chloride) is a good disinfectant and it can destroy many of the pathogens on surfaces. There is no description on what caused the fever. If it is a simple viral or bacterial fever, I think you have already done whatever needs to be done. Infections not only are transmitted through surfaces; rather it can be acquired through air droplets also. So my recommendation is to maintain general hygiene standards, get appropriate vaccinations for the age. I hope the above information helps you. Thanks for writing into healthcaremagic. Take care of your daughter.