def read_blast_results(filepath):
    """
    Read blast results and return counts of blast search hits
    """
    hits = {}
    with open(filepath) as infile:
        line = infile.readline()
        while line:
            hit = line.strip().split(',')[1]
            if hit in hits:
                hits[hit] += 1
            else:
                hits[hit] = 1
            line = infile.readline()
    return dict(sorted(hits.items(), key=lambda x: x[1])[::-1])
