"Results: The addition of zinc sulfate did not impact the length of hospitalization, duration of ventilation, or ICU duration. In univariate analyses, zinc sulfate increased the frequency of patients being discharged home, and decreased the need for ventilation, admission to the ICU, and mortality or transfer to hospice for patients who were never admitted to the ICU"

HCQ is an enabler; zinc does the heavy lifting but only if administered early.

See my other comment downvoted to oblivion below.

https://www.medrxiv.org/content/10.1101/2020.05.02.20080036v...

Hydroxychloroquine is just one of several zinc ionophores that inhibit viral replication. "Zinc Ionophores Pyrithione Inhibits Herpes Simplex Virus Replication" https://pubmed.ncbi.nlm.nih.gov/23867132/

"... the virus replicative cycle can be divided into 10 steps (Fig. 52-1): (1) adsorption, (2) penetration, (3) uncoating, (4) early transcription, (5) early translation, (6) replication of the viral genome, (7) late transcription, (8) late translation, (9) assembly, and (10) release of new virus particles."

If using HCQ as a zinc ionophore which targets replication, "antiviral drug treatment should be started early, before irreversible tissue damage occurs. Such timely treatment is not possible without early and accurate diagnosis, which is difficult for many viral infections (such as infections of the respiratory tract)" https://www.ncbi.nlm.nih.gov/books/NBK8119/