BA.2 is a new more infectious subvariant of Omicron BA.1 & it is replacing BA.1 fast.

Both are still called Omicron, although BA.2 should at least be named Omicron Plus.

Omicron has already mutated to a more fit variant undermines the theory of predetermined endemic victory. pic.twitter.com/YmM53ETdfI

— Naila T Rahman নায়লা তাসনীম (@nailatrahman) January 17, 2022

Un vaccino che non immunizza darà vita a sempre nuove varianti. Fino a quella definitiva. E’ un gioco di probabilità. Alla fine il virus muterà nella forma più adatta per diffondersi meglio, tipo Omicron, ma con una virulenza più alta. E’ questo il problema di vaccinare in massa con un vaccino che non è tale. E lasciare quindi diffondersi il virus: ovvero replicare milioni di volte.

Sarebbe nata in India lo scorso dicembre (quasi l’80% dei casi ha questa sequenza) per poi diffondersi in Cina, Israele, Danimarca, Australia, Canada e Singapore. Ed ora anche nel Regno Unito.

Here's the latest variant picture for Singapore.

BA.2 (Omicron) is rising rapidly in January, reaching 18% frequency by 9 January. pic.twitter.com/TiXKjsCzRQ

— Mike Honey 💉💉💉 (@Mike_Honey_) January 17, 2022

Here's the latest variant picture for India.

BA.2 (Omicron) appears to have recently passed BA.1 and reached 40% frequency. Recent sample sizes are very low. pic.twitter.com/bkSkDzFkdr

— Mike Honey 💉💉💉 (@Mike_Honey_) January 17, 2022

Sulla sottovariante Covid ribattezzata Omicron 2 “dobbiamo un po’ capire quanto è diffusiva e quali caratteristiche ha. Quindi direi per ora stiamo in campana”, afferma il virologo Fabrizio Pregliasco, docente della Statale di Milano.

La variante BA.2 appartiene allo stesso ceppo di Omicron, ma si distingue dalla ‘sorella maggiore’ per alcune mutazioni della proteina Spike. “Speriamo – dice l’esperto all’Adnkronos Salute – che non abbia caratteristiche diverse, ma purtroppo è tutto da scoprire”.

Questa variante non viene individuata dagli attuali test rapidi. E potrebbe spiegare l’apparente appiattimento della curva dei contagi in Italia.

Here's the latest variant picture for Denmark.

BA.2 (Omicron) has been rising steadily since mid-December, reaching 28% frequency. pic.twitter.com/Ak1OGUJTgF

— Mike Honey 💉💉💉 (@Mike_Honey_) January 17, 2022

Here's the latest variant picture for BA.2 (Omicron). Globally it is far less common than it's sibling BA.1 lineage.

BA.2 has 28 unique mutations so very different.

The frequency of BA.2 is rising in several countries, notably India, Denmark & Singapore.
🧵 pic.twitter.com/0gjjYwWuff

— Mike Honey 💉💉💉 (@Mike_Honey_) January 17, 2022

Ese "algo" que impidió que Dinamarca tuviera esa bajada fue el ingreso de una nueva variante Ómicron que está quitándole a anteriores variantes terreno.
BA.2 parece lograr abrirse camino en donde otros Ómicron habían ya estado. (sigue) pic.twitter.com/EMwd3mTLwJ

— David Giordano (@3dgiordano) January 17, 2022

Unlikely due to the fact that reinfection with a strain of omnicron is already so common. No herd immunity for omicron, BA.2 will likely use this to its advantage. It also increasing as we speak and way harder to detect with a PCR test.. its not really looking good. pic.twitter.com/yCouUcoAgu

— Ryno (@Ryno55380919) January 17, 2022

While #Omicron BA.1 leads the race, the little sister BA.2 is catching up in numbers. They are rather different with likely functional implications. BA.2 might be more immune evasive in RBD, less in NTD. And due to reduced mutation load in NTD maybe different fusion properties? pic.twitter.com/kEACjzQDs3

— Ulrich Elling (@EllingUlrich) January 12, 2022