If COVID19 is a strain of the flu and HCQ is effective, why have a vaccine for either?
Viral vs. bacterial – how they differ
Those with viral pneumonia will often experience mild fatigue, congestion and coughing without mucus. Since the symptoms of viral pneumonia are usually considered mild, minimal treatment is required. It can be more serious, however, for young children, the elderly and people with weakened immune systems.
People with bacterial pneumonia will often have colored mucus, a fever and chest pain. They should seek medical attention to prevent lung damage.
Bacterial pneumonia can sometimes develop after a cold or flu and often is caused by exposure to the streptococcus pneumonia germ.
https://health.clevelandclinic.org/how-to-tell-if-its-pneumonia/
Covid19 is viral pneumonia
A de facto standard is a custom or convention that has achieved a dominant position by public acceptance or market forces.
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Maybe the flu is engineered every year, that keeps the cdc and big pharma in business.