according to the question, the observed microorganism have the following characteristics:
1. rod shaped.
2. linked in a chain.
3. stains purple.
The rod shaped bacteria are referred as the bacilli. The bacteria, which are found linked in a chain are given a prefix strepto. The bacteria, which stain purple with the gram stains are called gram positive bacteria.
Hence, from the information, the possible microbe is gram positive Streptobacillus.
