The federal government will consider whether to include booster shots in the next version of the coronavirus vaccine mandate for its workers, said the Treasury Board as it reviews the rules.

The government must review the need for the policy, which currently requires federal public servants to get two doses of the vaccine or face unpaid leave, after six months. That timeline runs out this week and, while the Treasury Board has consulted with unions over the last several weeks, the Public Service Alliance of Canada says it’s in the dark about which direction the government will go.

“They have said, ‘You will see a renewed policy on April 6,”’ said Chris Aylward, national president of the union, in an interview. “I have no idea what that renewed policy might look like.”

Read: Trudeau mandating coronavirus vaccinations for federal employees

While the review could deem the mandate is no longer necessary, the government could also opt to expand it to encourage more members of the public service to get a booster shot. “Any decisions will be based on science and the advice of public health officials,” said Mona Fortier, president of the Treasury Board, in a statement Monday.

As it stands, any worker in the core public administration, as well as the Royal Canadian Mounted Police, must attest that they’re fully vaccinated or risk being put on leave without pay. The policy applies even to employees who work from home. The policy document states the goal of the mandates is to protect employees, their colleagues and clients against the coronavirus and boost vaccine rates across the public service.

Fortier confirmed last week the definition of “fully vaccinated” is also being considered as part of the review.

More than 98 per cent of federal public workers have attested that they’re fully vaccinated against the coronavirus with two doses as of March 28. If the definition of fully vaccinated is changed, workers may need a booster to keep their pay.

Read: Vaccine policies gaining steam with small-, medium-sized employers

Vaccination rates in the general population are similarly high, at about 90 per cent for those 18 years or older as of March 27. But uptake of boosters has been slower, at just 57 per cent. Approximately 2,690 workers, representing about one per cent of the federal workforce, requested some kind of accommodation in the last six months. Aylward said “very, very few” employees have been placed on leave.

Unions have pushed back on the vaccine mandate ahead of the six-month review. The Professional Institute of the Public Service of Canada urged the government to determine when the policy will no longer be needed, given the high vaccination rate across the country. “As provinces ease restrictions, the employer must do the same and allow members on leave without pay to come back to work,” said the PIPSC in a statement.

PSAC recently filed a grievance against the existing policy on behalf of all members who have been put on leave without pay because of their vaccination status. Putting the unvaccinated on leave without pay is harsh, argued the union, and can be considered disciplinary and without cause.

PSAC also filed grievances against the policy in December 2021 on behalf of Treasury Board employees who work remotely and earlier this month for Canada Revenue Agency employees who work from home.

Read: ‘Significant’ wave of terminations coming due to workplace vaccine mandates: lawyer

The union said at the time the vaccine mandate for remote workers constituted an abuse of management, since people with little prospect of returning to physical workplace posed no reasonable threat to health and safety.

The government has made accommodations for people on certain medical, religious or other grounds protected by the Canadian Human Rights Act.