Pharmaceutical company says it is also examining using a higher dose of its existing vaccine against new strain

Firm that developed vaccine with Pfizer says it will have more data available next month, but has plans in motion to be able to mass-manufacture adapted inoculation

Strain causing anxiety around the world given Greek alphabet designation, in line with previous major variants such as Delta, as scientists race to understand its risks

Little is yet known of new strain, but it appears to be most heavily mutated version of the virus yet -- which could affect transmissibility and potentially limit vaccine efficacy