The 21-day lockdown announced by Prime Minister Narendra Modi last month has been by and large effective in containing coronavirus, especially in states that have been able to implement it properly. Data from various states show that in most, the transmission of the highly infectious virus - which has infected more than 9,000 people across the country -- has been arrested. While states like Kerala and Tamil Nadu have been most successful, a few trouble zones remain, a list of which is headed by Maharashtra and Gujarat.