Vaccine worries

My son has been enrolled to start primary school, but at a recent orientation day I found out many of the kids that will be in his class haven’t been vaccinated. Should I be worried? A.S. Parents of the non-immunised children have more to worry about because those children will be more vulnerable to vaccine-preventable diseases to which they become exposed. These parents rely on parents like you to reduce their child’s risk of exposure to infections.