(a) The trends of SARS-COV-2 infection of different age groups in the household mode. (b) The trends of SARS-COV-2 infection of different age groups in the general mode. The blue solid lines denote confirmed cases aged between 0 and 19. The red dot lines denote the confirmed cases aged between 20 and 49. The black dot lines denote the diagnosed cases aged between 50 and 74. The green dot lines represent the documented cases over the age of 75.