Study illustrates risk of Omicron infection in fully vaccinated individuals

Infections caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Omicron (B.1.1.529) variant are common among individuals who have recovered from prior infection or have been vaccinated against the coronavirus disease 2019 (COVID-19).

The Omicron has quickly overtaken the SARS-CoV-2 Delta variant as the dominant circulating strain globally. Currently, the original Omicron strain is being replaced by its newer sub-lineages BA.2, BA.3, BA.4, and BA.5. Despite its high infectivity, few studies have documented serial Omicron infectivity.

In a new study published on the medRxiv* preprint server, scientists studied SARS-CoV-2 humoral responses in a healthy young person who was infected by the Omicron BA.1.15 variant ten weeks after receiving a third dose of the BNT162b2 vaccine. This individual was subsequently reinfected with the BA.2 strain thirteen weeks later. The responses of this individual were compared to those of 124 COVID-19 naive vaccine recipients.

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During the Canada Post strike announced September 25, 2025, the following measures will be undertaken to minimize service disruption to BC-CfE clients and providers.

  • The BC-CfE Laboratory has transitioned to private courier for delivery of outgoing reports and documents. Results required urgently can be faxed upon request. (Lab Contact Information: Phone 604-806-8775; FAX 604-806-9463)
  • The BC-CfE Drug Treatment Program (DTP) will fax outgoing forms and documents to the provider’s office. (DTP Contact Information: Phone 604-806-8515; FAX 604-806-9044)
  • St. Paul’s Hospital Ambulatory Pharmacy has transitioned to private courier for delivery of medications. We recommend requesting medication at least 2 weeks in advance in case of delivery delays, particularly to rural/remote parts of BC. (Contact Information: Phone 1-800-547-3622; FAX 604-806-8675)

During the Canada Post strike, we recommend that documents be faxed or couriered to our sites, versus utilization of regular mail service

The BC-CfE Laboratory is streamlining reporting processes for certain tests in order to simplify distribution and record-keeping, and to ensure completeness of results. Beginning September 2, 2025, results for the ‘Resistance Analysis of HIV-1 Protease and Reverse Transcriptase’ (Protease-RT) and ‘HIV-1 Integrase Resistance Genotype’ tests will be combined into a single ‘HIV-1 Resistance Genotype Report’.
For more details and example reports, please click on the button below

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