ZAMBIAN President Edgar Lungu has banned campaign rallies ahead of elections scheduled for August 12, saying large gatherings risked spreading the COVID-19 virus. Lungu, a lawyer, is pitted against economist Hakainde Hichilema of the United Party for National Development (UPND), whom he narrowly beat in the 2016 elections. Zambia, Africa's No.2 copper producer, is in the grips of an economic crisis after it failed to make payment of a coupon on one of its dollar bonds in November, dragging it into sovereign default. Opposition parties have pilloried Lungu's handling of the crisis. Last year, police shot dead two people after…