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Pfizer said on Thursday (June 1) data from late-stage trials showed its experimental combination of antibiotics was effective in treating deadly infections caused by drug-resistant bacteria. Deaths from antibiotic-resistant bacteria, also known as superbugs, have been on the rise globally, and health regulators have called for the development of newer treatments as resistance to older antibiotics grows. The late-stage studies compared the experimental combination of the antibiotics aztreonam-avibactam (ATM-AVI) and existing generic drug metronidazole with a combination of two older antibiotics - meropenem and colistin - to treat complicated intra-abdominal infections and types of hospital-acquired pneumonia. Hospital-acquired pneumonia occurs in patients at least two to three days after being admitted, or in those who have life-threatening lung infections with high mortality rates and who are on mechanical breathing machines. Pfizer said the data from the studies shows the antibiotic combination of ATM-AVI is effective and well-tolerated in treating infections caused by gram-negative bacteria. The cure rate in patients with complicated intra-abdominal infections with Pfizer's combination therapy, along with existing generic drug metronidazole, was 76.4%, versus 74% using the other antibiotics.

BioNTech and Pfizer are to start tests on humans of next-generation vaccines that protect against a wide variety of coronaviruses in the second half of the year. Their experimental work on shots that go beyond the current approach include T-cell-enhancing shots, designed to primarily protect against severe disease if the virus becomes more dangerous, and pan-coronavirus shots that protect against the broader family of viruses and its mutations. In presentation slides posted on BioNTech's website for its investor day, the German biotech firm said its aim was to "provide durable variant protection". The two companies are currently discussing with regulators enhanced versions of their established shot to better protect against the Omicron variant and its sublineages. The virus' persistent mutation into new variants that more easily evade vaccine protection, as well as waning human immune memory, have added urgency to the search by companies, governments and health bodies for more reliable tools of protection. As part of a push to further boost its infectious disease business, BioNTech said it was independently working on precision antibiotics that kill superbugs that have grown resistant to currently available anti-infectives.