Safety and efficacy of intranasal delivery of BromAc® (Bromelain & Acetylcysteine) in swab positive SARS-CoV-2 COVID-19 patients

Since December 2019, we have been facing our third severe acute respiratory syndrome (SARS) due to a coronavirus in 18 years, known as SARS-CoV-2. There are currently few therapeutic agents and of only limited efficacy. The large majority of patients are diagnosed with a mild form of the virus. The SARS-CoV-2 virus, with its clinical syndrome known as COVID-19, is made up of spike protein (S), nucleocapsid protein (N) that contains the RNA, membrane protein (M) and the envelope protein (E). The spike protein that is responsible for initiating internalization of the virus genome into human lung cells protrudes on the outer surface and is a number of amino acids and glycoproteins. Recent insights strongly support the theory that the nose is the primary site of infection, from where the infection is prone to progress to the lung, suggesting the potential for early nasal-directed treatment. Bromelain and Acetylcysteine (BromAc®) is a palliative treatment for highly mucinous tumours of the appendix due to its ability to remove glycosidic linkages and disulphide bonds. Bromelain is already known to remove the spike protein and haemagglutinin of similar viruses, including Semliki Forest virus, Sindbis virus, mouse gastrointestinal coronavirus, hemagglutinating encephalomyelitis virus and H1i1 influenza viruses, rendering these non-infective, Acetylcysteine has already been used as an anti-viral. It inhibits influenza A and induced production of pro-inflammatory molecules in lung epithelial cells. In a murine model of lethal influenza infection, an increased survival was seen in the acetylcysteine combination with oseltamivir group (100% vs 60%). We predicted and have now shown that BromAc® can disrupt and completely cleave the glycoproteins of the SARS-CoV-2 virus, which have a detrimental effect on the virus, rendering it non-infective. We believe that BromAc® may be suitable in clinical application with delivery intranasally in swab PCR positive SARS-CoV-2 outpatients. This drug has the potential to reduce infectivity of those with SARS-CoV-2, potentially reducing exposure to close contacts and progression of the disease into COVID19 syndrome, and act as a prophylactic to prevent the virus from binding to host cells.