Mexico emerged on Wednesday from five days of lockdown as traffic clogged streets and taco vendors worked the sidewalks after extraordinary measures aimed at containing the deadly H1N1 flu were lifted.

Companies from cement maker Cemex to brewer Femsa went back to work and Mayan ruins and Aztec pyramids reopened to tourists, although many small enterprises were nervous that lingering fear over catching swine flu would smother business for days to come.