Dec 21 (Reuters) - China may be struggling to keep a tally of COVID-19 infections as the country experiences a big spike in cases, a senior World Health Organization official said on Wednesday, amid concerns about a lack of data from the country. "In China, what's been reported is relatively low numbers of cases in ICUs, but anecdotally ICUs are filling up," WHO's emergencies director Mike Ryan said. "I wouldn't like to say that China is actively not telling us what's going on. REUTERS/Denis BalibouseThe WHO said it was ready to work with China to improve the way the country collects data around critical factors such as hospitalisation and death. China has nine domestically developed COVID-19 vaccines approved for use, more than any other country, but they have not been updated to target the highly infectious Omicron variant.

---