Food Poisoning Ruined The Project

You are a Project Manager. You have a tight schedule. Seven people are working on this project. There are two days left for the last delivery. This morning when you came in there is a disaster waiting for you. Three of your project team members have reported sick. Turns out that they had gone to a nearby restaurant and this seems to be a case of food poisoning. With your project in crisis, you turn to your boss. In stead of being sympathetic she tells you that as a project manager you should have catered for such risks. She asks you to handle the situation. "We all work under constraints," she say. You know that the remaining team members cannot take the additional load. You contact your customer and he is not available. He has been reminding you over the complete duration of the project that a slippage is unacceptable.

What do you do?

What do you do?

PS: My views here:
Should feed poisoning be allowed to ruin the project

Managing Risks Beyond the Obvious