| Symptoms observed in January | 
| Symptoms observed in February | 
| Symptoms observed in March | 
| Symptoms observed in April | 
| Symptoms observed in May | 
| Symptoms observed in June | 
| Symptoms observed in July | 
| Symptoms observed in August | 
| Symptoms observed in September | 
| Symptoms observed in October | 
| Symptoms observed in November | 
| Symptoms observed in December |