"We can all do our bit to reduce the demands on our health service, by working out with our family and friends on how we can all look after each other."
He encouraged businesses and individuals to continue planning in case the virus started to be transmitted within the community.
"People should think about what they need to do if they had to be in self-isolation for two weeks. Are you set up to do online shopping? Can a friend drop things at your door? Think about medications, as well as food, pet food and other essential supplies."
Macdonald said the group was co-ordinating with other agencies to help meet the basic needs of people who were struggling.
"We know it's all too easy to say, 'just order your groceries online', or 'work from home – you'll be fine'. But for some people in self-isolation, it's just not that simple.
"While most people will be able to manage self-isolation on their own or with help from their family and friends, we're putting plans in place to help those who really need it."
Macdonald said maintaining community connections was especially important for people who must self-isolate.
"Everyone, sick or healthy, stays in better spirits knowing they are part of a community."
He said the group was also making contingency plans in case a different emergency was to arise while the community was dealing with a pandemic.
"We know that other emergencies can happen at any time, so we're working on how we can respond to any other event while the region may be affected by Covid-19."
The HBCDEM building cost $1.5 million, and its role is to act as a control centre for agencies in times of emergency.
It has an IL4 rating which means it is able to withstand a one in 2500 year seismic event, and the building can be tailored for specific incidents to ensure effective response to, and recovery from, emergencies.