The World Health Organization on Thursday warned that it is struggling to identify and track new Covid variants as governments roll back testing and surveillance, threatening the progress made in the fight against the virus.

Maria Van Kerkhove, the WHO’s Covid-19 technical lead, said the virus is still circulating at an “incredibly intense level” around the world. The WHO is “deeply concerned” that it is evolving at a time when there is no longer robust testing in place to help rapidly identify new variants, Van Kerkhove said.

“Our ability to track variants and subvariants around the world is diminishing because surveillance is declining,” Van Kerkhove told reporters during an update in Geneva. “That limits our ability to assess the known variants and subvariants but also our ability to track and identify new ones.”

WHO Director-General Tedros Adhanom Ghebreyesus on Thursday warned there’s the “ever present risk of more dangerous variants emerging” as the virus continues to spread and change. Tedros said “the pandemic is not over but the end is in sight,” contradicting President Joe Biden’s assertion earlier this week that the pandemic had ended.