Essential oils against coronavirus

Certain essential oils can be effective against flu virus.

Inactivation of Airborne Influenza Virus 

11 Best Antiviral Essential Oils

Best essential oils for flu symptoms

Bergamot

Eucalyptus

Red Thyme

Cinnamon Leaf

Tea Tree

Lemon Balm

Read more about:
Eucalyptus
Blue yarrow
Rosemary
Kumquat
Lavender
Cinnamon bark

Especially for respiratory tract
Eucalyptus
Thyme
Douglas fir

Eucalyptus against Swine Flu virus.

Essential Oils to Prevent the Spread of Flu
This is a long scientific article about the biology of influenza and there is also a chapter about the treatment with essential oils.

Chemical Constituents of Essential Oils Possessing Anti-Influenza A/WS/33 Virus Activity

Antibacterial, antifungal, and antiviral effects of three essential oil blends

Off The Grid News: 8 Antiviral, Antibacterial Essential Oils

Nature´s Gift: A very long list of Antiviral Essential Oils
In their opinion, the most powerful antiviral oils are Ravensara Aromatica and Ravintsara.