Aug 20 (Reuters) - The UK drug regulator has approved an antibody cocktail developed by Regeneron (REGN.O) and Roche (ROG.S) to prevent and treat COVID-19, it said on Friday, as the nation battles rising hospitalisations due to the more infectious Delta variant. The Medicines and Healthcare products Regulatory Agency (MHRA) said clinical trial data shows the drug Ronapreve could help prevent infection, help resolve symptoms of severe COVID-19 infection and reduce the chances of hospitalisation. "This treatment will be a significant addition to our armoury to tackle COVID-19," British health minister Sajid Javid said in a statement. The news comes as hospitalisations of COVID-19 patients exceeded 6,100 this week, a five-month high. Two thirds of hospitalised patients were not vaccinated, data showed earlier this month. Ronapreve, known as REGEN-COV in the United States, can be taken via injection or infusion. It binds tightly to the coronavirus at the lining of the respiratory system and prevents it from gaining access to cells of the respiratory system, the MHRA said. Ronapreve belongs to a class of drugs called monoclonal antibodies which mimic natural antibodies produced by the body to fight off infections. The drug is not intended to be used as a substitute for vaccination, the MHRA said. Javid said the government would start to roll out the therapy across the NHS as soon as possible. It"s the third therapy in the UK"s arsenal in addition to generic steroid dexamethasone and arthritis drug tocilizumab, sold by Roche as Actemra and RoActemra. Earlier this week, Roche warned of a global shortage of its arthritis drug which will last a few more weeks. read more Ronapreve/REGEN-COV received emergency approval to treat COVID-19 in more than 20 countries including the United States, which has also authorised a similar treatment by Eli Lilly (LLY.N) for non-hospitalized COVID-19 patients. read more It has been a big earner for Regeneron, which logged U.S. sales of $2.59 billion in the second quarter. read more In June, the European Union bought about 55,000 doses of the treatment while the region"s drug watchdog reviews the drug for approval. Reporting by Muvija M and Sachin Ravikumar in Bengaluru and Josephine Mason in London; editing by Jason Neely, Elaine Hardcastle Our Standards: The Thomson Reuters Trust Principles.