HONG KONG – In a surprisingly candid statement, the director of China’s Centers for Disease Control conceded that the efficacy of Chinese coronavirus vaccines is "not high" and may require improvements. George Gao, the director of China’s CDC, stated that Chinese vaccines “don’t have very high protection rates” at the National Vaccines and Health conference in the southwestern city of Chengdu on Saturday.

CAJICA, Colombia – Following the start of phase III trials for its COVID-19 vaccine, Soberana 02, Cuban researchers have started phase III trials for Abdala (CIGB-66), another vaccine candidate developed in the island country.

LONDON – The EMA has concluded that the rare cases of serious blood clots with low platelet counts seen after administration of Astrazeneca plc’s COVID-19 vaccine are caused by the vaccine, but said the benefits of its use continue to outweigh the risks. The possibility of cerebral venous sinus thrombosis and splanchnic vein thrombosis in the abdomen will now be listed as rare side effects and the EMA’s guidance to health care professionals will be updated.

If these top-line phase III results were a grade card for 12- to 15-year-olds, they would be on the honor roll: The Pfizer Inc.-Biontech SE COVID-19 vaccine is 100% effective for the age group and produced robust antibody responses. The new results play out against a backdrop of increased production and big revenue estimates.

As COVID-19 vaccinations continue to roll out, momentum builds with strong phase III data for what could become the fourth and fifth walls of defense in the U.S. With three vaccines already authorized, research reported in March offers hope for a second adenovirus vector vaccine candidate with Astrazeneca plc’s AZD-1222, as well as for the first protein subunit vaccine option with Novavax Inc.’s NVX-CoV2373.

Following the company’s COVID-19 manufacturing misstep, Emergent Biosolutions Inc. continued its struggle to rebalance as top-line data from a phase III study it participated in failed to hit its primary endpoints with statistically significant results. The data showed that adding anti-SARS-CoV-2 hyperimmunoglobulin to standard of care, inclusive of remdesivir, for hospitalized adult COVID-19 patients with symptoms for less than 12 days failed to provide clinical benefit when compared to standard of care plus placebo. The global, multicenter double-blind, placebo-controlled randomized study assessed the safety and efficacy of four immunoglobulin candidates, the SARS-CoV-2 immune globulin intravenous (human) (COVID-HIG) plus standard of care.

As COVID-19 vaccinations continue to roll out, momentum builds with strong phase III data for what could become the fourth and fifth walls of defense in the U.S.