Liquid antimicrobial disinfectant compositions for treatment of coronaviruses and specifically the Covid-19 virus (SARS-CoV-2) on skin and surfaces such as PPE (personal protective equipment) are disclosed that are highly efficacious and exhibit total eradication below detectable limits at 30 minutes (>6 log kill) against coronavirus (resulting in complete inactivation), while remaining non-toxic, safe and non-irritating (including at a cellular level and with extended contact) to skin and endogenous tissue. Such disinfectant compositions are additionally highly effective against other pathogens, have extended antimicrobial and antiviral activity for more than 24 hours, have a bio-compatible pH, are suitable for personal, clinical and surgical use and are safe to skin, mucous membranes and wounds, remain stable without precipitation, discoloration or loss of antimicrobial efficacy for at least 12 months, and are beneficial for a range of applications and uses in improving and supporting human and animal health.