Post styling hooks for fetched posts

In order to allow differential styling of posts i normally add an incremental $count to my loops

Something like:

$count = 0; //set up counter variable
 while (have_posts()) : the_post();
 $count++; //increment the variable by 1 each time the loop executes
   $html = "<article class=\"post-{$count}\">'";
   ...
 endwhile;

This allows me to output:
<article class="post-1">...</article>
<article class="post-2">...</article>

However, I’m unable to use this method with Infinite-Scroll as the count is reset with each ajax fetch.

Anyone found a work around for it?

https://wordpress.org/plugins/infinite-scroll/