Moderna vax starts at 30% VE against Omicron (ignoring first 14 days) and becomes negative at 6 months (reported as zero, see below). Booster increases to 52% unadjusted VE which declines to 36% after 2-3 months. medrxiv.org/content/10.110…
The authors arbitrarily set the lower bound at zero for calculating VE, even though the odds ratio is negative at 6 months. 
"while VE of 2 doses of mRNA-1273 against infection with delta is high and wanes slowly, the 2-dose VE against omicron infection is poor and wanes quickly, providing minimal protection of 30% within 3 months of vaccination and virtually none thereafter."
"while the 3-dose VE against infection with delta is high and durable, that against omicron is lower."
"this study of mRNA-1273 found waning 2-dose VE against delta, high VE 3-dose VE against delta, and low 2-dose and 3-dose VE against omicron. Protection against omicron wanes within 3 months after dose 2, suggesting a need for a shorter interval between second and booster doses."
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