Guido Vanham, a Belgium-based virologist who is expert on the spread of viruses, composed a fatherly letter of advice to his children on how to combat battle fatigue from fighting COVID-19. The missive was sent to his three offspring, including son Peter Vanham of Geneva, Switzerland, who is the head of the International Media Council at the World Economic Forum and a member of its COVID-19 Taskforce, according to Business Insider.

The letter from the senior Vanham went viral, pardon the pun, after his son gave the media permission to publish it.

“It’s been half a year since the COVID pandemic started, and I understand you must have ‘COVID fatigue’ by now,” said Guido Vanham in his letter. “So, let me offer you some advice and tips on how to go about your daily lives in the coming months. It’s needed, I reckon, because we still have a long way to go.”

According to Business Insider, some of the tips include:

• The virus does not think, said Vanham, and does not negotiate the conditions for spreading. He added that the virus is transmitted not only by droplets from coughing and sneezing but also by aerosol transmission. Recently, the U.S. Centers for Disease Control and Prevention changed its stance on virus transmission, admitting that COVID-19 can be spread by “small particles, such as those in aerosols,” according to The Washington Post. So wearing a well-fitted mask without any gaps and preferably with a filter is advisable, said Vanham, according to Business Insider.
• He recommended wearing masks indoors and outdoors where large crowds gather.
• Vanham advised that his children meet people outdoors and keep windows open as much as possible to help balance their social and professional lives safely.
• Put children first, said Vanham. The virologist acknowledged, according to Business Insider, that children can become virus “vectors” even if it is unlikely that they will get sick. “Kids need to go to school,” he wrote. “At their age, they need to learn. So, if we have to take stricter measures again, let it be us, as adults, who lock down. You can tele-work; for children, it’s much harder to tele-learn.”

Vanham said he was optimistic that a vaccine will be developed by the first half of 2021 or that the virus itself may weaken.

“As of today, we can’t be sure yet,” he concluded, according to Business Insider. “So caution is advised: Let’s make preventive measures our habit.”