There is a myth out there that each year Oct-Apr is a flu season.
Flu what?
It's a conspiracy theory, probably created by big PHARMA.
Did you know, that the cold is actually good for you? Just Google Wim Hof 
And at the event you are hooked, I recommend cold something every day, it can be a cold shower, cold swim, or just rubbing your body with snow or ice
yeah, get your family involved into diving into the pile of snow in your bathing or birthing suit? Have some fun! Don't be shy.
What else can help?
Yoga, especially a hot one. I personally swear by it for 9 years and counting
Essential oils and specifically rubbing your hand and feet with lavender oil just before bed, it's safe for babies and kids
Dry brushing
Jumping on trampoline
And last but not least, eat clean plant-based and raw diet as much as possible.
Stay away from chemicals of any kind.
Do not get the flu shot!!! You will get sick if you do if not this year, then the next.
Stay hydrated.
Keep the positive vibe.
I am turning 50 this year, have no personal experience with flu and never taken the shot.
What does it tell you?
Say no flu this year and go and subject your body to some cold. Just do it! Get adventurous!