The Delta variant, isolated for the first time in a state of India, is present in 16 Italian regions and was detected, at national level, on the 22,7% of sequenced swabs. The data, present in the latest report by the Istituto Superiore di Sanità (ISS), the Ministry of Health and the Bruno Kessler Foundation, refer to a flash survey on 777 samples taken on 22 June. Despite, therefore, the situation could have changed in the meantime, and Delta is also represented in regions not mentioned in the institutional report (due to the lack of sampling), the framework at 22 June however highlights a increase of the Delta variant from1% to 22% prevalence in 30 days (this is how long it takes for the Delta variant to be transmitted).
What are the regions in which the Delta variant has been identified
The regions where the variant was found Delta are Abruzzo, Calabria, Campania, Emilia-Romagna, Friuli Venezia Giulia, Lazio, Liguria, Lombardy, Marche, Bolzano, Piedmont, Puglia, Sardinia, Sicily, Tuscany, Veneto. “Delta’s growth is an expected figure”, commented Silvio Brusaferro, president of the ISS. “It must be monitored with great attention and it is essential to insist on the systematic tracking of cases”.
Here, the tracking: as long as the number of cases remains below the threshold of 50 per 100 thousand inhabitants, monitoring the positives is possible. In Italy we are well below this threshold. Sequencing is one of the main weapons against the most contagious variant, which in England is responsible for the record levels of positivity recorded across the Channel in recent days.
How effective are the Delta variant vaccines
The other defense is called the vaccine. All 4 EMA approved products available in Italy offer good protection against the Delta variant, albeit after the second dose (except in the case of Johnson & Johnson which is single-dose).
A new study conducted in the United States shows aPfizer efficacy at 36% and of AstraZeneca al 30% after first dose in contrast to the Delta variant. A small English study that had as its object Modern, demonstrated its effectiveness after two doses just over 94%. A threshold that yes reduces from 3.2 to 2.1 times in the case of the Delta variant.
There is less data on single doses. The preparation proved effective against the Delta variant even eight months after inoculation, with a small decrease in potency and a second dose of vaccine does not appear to be immediately necessary.
Here are more details on the effectiveness of vaccines against the Delta variant.