What is the sentiment of this news? Please choose an answer from {strong negative/moderately negative/mildly negative/neutral/mildly positive/moderately positive/strong positive}.
Text: As the world grapples with another Covid surge, macroeconomic recovery has become a key concern for authorities leading to fewer restriction measures. The shares of United Airlines observed another round of sell-off after WHO declared the Omicron mutation as a variant of concern and investors were.
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