The Johnson & Johnson vaccine differs from the Pfizer/BioNTech, Moderna and AstraZeneca vaccines due to the fact it is a single dose vaccine, while all the other approved vaccines in the European Union are two dose vaccines.
"We're still struggling to get started", she admitted, adding that a mechanism had been launched to allow member states to share doses between them once supplies permitted.
The weather problems are just another hiccup in a long line of vaccine rollout problems the country has faced in recent months.
Pfizer this week delivered 4.8 million doses of its Covid vaccine, which is developed alongside German partner BioNTech, to the EU.
But the bloc is still 10 million doses short of what Pfizer was said to have promised to member states since the rollout began late previous year.
The slight increase was said to reflect the firm's efforts to make up for earlier shortfalls in deliveries.
Pfizer has locked in a delivery schedule for the next six weeks to meet the end-of-March deadline.
Muscat: The Ministry of Health is giving Pfizer-BioNTech and Oxford-AstraZeneca, the two vaccines against coronavirus (Covid-19), to the target segments. But that calculation is based on an optimistic scenario where three other vaccines now under review - from AstraZeneca, Johnson & Johnson and Novavax - are approved by Health Canada and delivered on time. The company said that these doses will be delivered in the third and fourth quarter of 2021.
Pfizer and the European Commission did not immediately respond to requests for comment.
Most EU countries have so far done little or no sequencing at all.
Its vaccination programme has lagged behind those of the US, Israel and Britain, but the bloc is looking to quickly scale up.
Yesterday Brussels announce a deal with Pfizer for 200 million more doses, and announced a major new order of 150 million more Moderna jabs.
However, the European Commisson President Ursula von der Leyen insists member states should not be making bi-lateral deals with companies.
"But it's an ongoing learning process".